Q: What are the factor combinations of the number 311,640?

 A:
Positive:   1 x 3116402 x 1558203 x 1038804 x 779105 x 623286 x 519407 x 445208 x 3895510 x 3116412 x 2597014 x 2226015 x 2077620 x 1558221 x 1484024 x 1298528 x 1113030 x 1038835 x 890440 x 779142 x 742049 x 636053 x 588056 x 556560 x 519470 x 445284 x 371098 x 3180105 x 2968106 x 2940120 x 2597140 x 2226147 x 2120159 x 1960168 x 1855196 x 1590210 x 1484212 x 1470245 x 1272265 x 1176280 x 1113294 x 1060318 x 980371 x 840392 x 795420 x 742424 x 735490 x 636530 x 588
Negative: -1 x -311640-2 x -155820-3 x -103880-4 x -77910-5 x -62328-6 x -51940-7 x -44520-8 x -38955-10 x -31164-12 x -25970-14 x -22260-15 x -20776-20 x -15582-21 x -14840-24 x -12985-28 x -11130-30 x -10388-35 x -8904-40 x -7791-42 x -7420-49 x -6360-53 x -5880-56 x -5565-60 x -5194-70 x -4452-84 x -3710-98 x -3180-105 x -2968-106 x -2940-120 x -2597-140 x -2226-147 x -2120-159 x -1960-168 x -1855-196 x -1590-210 x -1484-212 x -1470-245 x -1272-265 x -1176-280 x -1113-294 x -1060-318 x -980-371 x -840-392 x -795-420 x -742-424 x -735-490 x -636-530 x -588


How do I find the factor combinations of the number 311,640?

Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 311,640, it is easier to work with a table - it's called factoring from the outside in.

Outside in Factoring

We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.

1 311,640
-1 -311,640

Why are the negative numbers included?

When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 311,640.

Example:
1 x 311,640 = 311,640
and
-1 x -311,640 = 311,640
Notice both answers equal 311,640

With that explanation out of the way, let's continue. Next, we take the number 311,640 and divide it by 2:

311,640 ÷ 2 = 155,820

If the quotient is a whole number, then 2 and 155,820 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!

Here is what our table should look like at this step:

1 2 155,820 311,640
-1 -2 -155,820 -311,640

Now, we try dividing 311,640 by 3:

311,640 ÷ 3 = 103,880

If the quotient is a whole number, then 3 and 103,880 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!

Here is what our table should look like at this step:

1 2 3 103,880 155,820 311,640
-1 -2 -3 -103,880 -155,820 -311,640

Let's try dividing by 4:

311,640 ÷ 4 = 77,910

If the quotient is a whole number, then 4 and 77,910 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!

Here is what our table should look like at this step:

1 2 3 4 77,910 103,880 155,820 311,640
-1 -2 -3 -4 -77,910 -103,880 -155,820 311,640
Keep dividing by the next highest number until you cannot divide anymore.

If you did it right, you will end up with this table:

12345678101214152021242830354042495356607084981051061201401471591681962102122452652802943183713924204244905305886367357427958409801,0601,1131,1761,2721,4701,4841,5901,8551,9602,1202,2262,5972,9402,9683,1803,7104,4525,1945,5655,8806,3607,4207,7918,90410,38811,13012,98514,84015,58220,77622,26025,97031,16438,95544,52051,94062,32877,910103,880155,820311,640
-1-2-3-4-5-6-7-8-10-12-14-15-20-21-24-28-30-35-40-42-49-53-56-60-70-84-98-105-106-120-140-147-159-168-196-210-212-245-265-280-294-318-371-392-420-424-490-530-588-636-735-742-795-840-980-1,060-1,113-1,176-1,272-1,470-1,484-1,590-1,855-1,960-2,120-2,226-2,597-2,940-2,968-3,180-3,710-4,452-5,194-5,565-5,880-6,360-7,420-7,791-8,904-10,388-11,130-12,985-14,840-15,582-20,776-22,260-25,970-31,164-38,955-44,520-51,940-62,328-77,910-103,880-155,820-311,640

More Examples

Here are some more numbers to try:

311,638311,639311,641311,642
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