Q: What are the factor combinations of the number 640,512?

 A:
Positive:   1 x 6405122 x 3202563 x 2135044 x 1601286 x 1067528 x 800649 x 7116812 x 5337616 x 4003218 x 3558424 x 2668832 x 2001636 x 1779248 x 1334464 x 1000872 x 889696 x 6672128 x 5004139 x 4608144 x 4448192 x 3336256 x 2502278 x 2304288 x 2224384 x 1668417 x 1536512 x 1251556 x 1152576 x 1112768 x 834
Negative: -1 x -640512-2 x -320256-3 x -213504-4 x -160128-6 x -106752-8 x -80064-9 x -71168-12 x -53376-16 x -40032-18 x -35584-24 x -26688-32 x -20016-36 x -17792-48 x -13344-64 x -10008-72 x -8896-96 x -6672-128 x -5004-139 x -4608-144 x -4448-192 x -3336-256 x -2502-278 x -2304-288 x -2224-384 x -1668-417 x -1536-512 x -1251-556 x -1152-576 x -1112-768 x -834


How do I find the factor combinations of the number 640,512?

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 640,512, 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.

1 640,512
-1 -640,512

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 640,512.

Example:
1 x 640,512 = 640,512
and
-1 x -640,512 = 640,512
Notice both answers equal 640,512

With that explanation out of the way, let's continue. Next, we take the number 640,512 and divide it by 2:

640,512 ÷ 2 = 320,256

If the quotient is a whole number, then 2 and 320,256 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 2 320,256 640,512
-1 -2 -320,256 -640,512

Now, we try dividing 640,512 by 3:

640,512 ÷ 3 = 213,504

If the quotient is a whole number, then 3 and 213,504 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 3 213,504 320,256 640,512
-1 -2 -3 -213,504 -320,256 -640,512

Let's try dividing by 4:

640,512 ÷ 4 = 160,128

If the quotient is a whole number, then 4 and 160,128 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 4 160,128 213,504 320,256 640,512
-1 -2 -3 -4 -160,128 -213,504 -320,256 640,512
Keep dividing by the next highest number until you cannot divide anymore.

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

1234689121618243236486472961281391441922562782883844175125565767688341,1121,1521,2511,5361,6682,2242,3042,5023,3364,4484,6085,0046,6728,89610,00813,34417,79220,01626,68835,58440,03253,37671,16880,064106,752160,128213,504320,256640,512
-1-2-3-4-6-8-9-12-16-18-24-32-36-48-64-72-96-128-139-144-192-256-278-288-384-417-512-556-576-768-834-1,112-1,152-1,251-1,536-1,668-2,224-2,304-2,502-3,336-4,448-4,608-5,004-6,672-8,896-10,008-13,344-17,792-20,016-26,688-35,584-40,032-53,376-71,168-80,064-106,752-160,128-213,504-320,256-640,512

More Examples

Here are some more numbers to try:

640,510640,511640,513640,514
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