Q: What are the factor combinations of the number 40,800,780?

 A:
Positive:   1 x 408007802 x 204003903 x 136002604 x 102001955 x 81601566 x 68001309 x 453342010 x 408007812 x 340006515 x 272005218 x 226671020 x 204003927 x 151114030 x 136002636 x 113335545 x 90668454 x 75557060 x 68001390 x 453342108 x 377785135 x 302228180 x 226671270 x 151114540 x 75557
Negative: -1 x -40800780-2 x -20400390-3 x -13600260-4 x -10200195-5 x -8160156-6 x -6800130-9 x -4533420-10 x -4080078-12 x -3400065-15 x -2720052-18 x -2266710-20 x -2040039-27 x -1511140-30 x -1360026-36 x -1133355-45 x -906684-54 x -755570-60 x -680013-90 x -453342-108 x -377785-135 x -302228-180 x -226671-270 x -151114-540 x -75557


How do I find the factor combinations of the number 40,800,780?

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 40,800,780, 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 40,800,780
-1 -40,800,780

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 40,800,780.

Example:
1 x 40,800,780 = 40,800,780
and
-1 x -40,800,780 = 40,800,780
Notice both answers equal 40,800,780

With that explanation out of the way, let's continue. Next, we take the number 40,800,780 and divide it by 2:

40,800,780 ÷ 2 = 20,400,390

If the quotient is a whole number, then 2 and 20,400,390 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 20,400,390 40,800,780
-1 -2 -20,400,390 -40,800,780

Now, we try dividing 40,800,780 by 3:

40,800,780 ÷ 3 = 13,600,260

If the quotient is a whole number, then 3 and 13,600,260 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 13,600,260 20,400,390 40,800,780
-1 -2 -3 -13,600,260 -20,400,390 -40,800,780

Let's try dividing by 4:

40,800,780 ÷ 4 = 10,200,195

If the quotient is a whole number, then 4 and 10,200,195 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 10,200,195 13,600,260 20,400,390 40,800,780
-1 -2 -3 -4 -10,200,195 -13,600,260 -20,400,390 40,800,780
Keep dividing by the next highest number until you cannot divide anymore.

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

123456910121518202730364554609010813518027054075,557151,114226,671302,228377,785453,342680,013755,570906,6841,133,3551,360,0261,511,1402,040,0392,266,7102,720,0523,400,0654,080,0784,533,4206,800,1308,160,15610,200,19513,600,26020,400,39040,800,780
-1-2-3-4-5-6-9-10-12-15-18-20-27-30-36-45-54-60-90-108-135-180-270-540-75,557-151,114-226,671-302,228-377,785-453,342-680,013-755,570-906,684-1,133,355-1,360,026-1,511,140-2,040,039-2,266,710-2,720,052-3,400,065-4,080,078-4,533,420-6,800,130-8,160,156-10,200,195-13,600,260-20,400,390-40,800,780

More Examples

Here are some more numbers to try:

40,800,77840,800,77940,800,78140,800,782
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