A:
Positive:
1 x 6442565355 x 12885130713 x 4955819565 x 9911639317 x 20323551585 x 4064714121 x 15633520605 x 31267
Negative:
-1 x -644256535-5 x -128851307-13 x -49558195-65 x -9911639-317 x -2032355-1585 x -406471-4121 x -156335-20605 x -31267
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 644,256,535, it is easier to work with a table - it's called factoring from the outside in.
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 | 644,256,535 | |
| -1 | -644,256,535 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 644,256,535.
Example:
1 x 644,256,535 = 644,256,535
and
-1 x -644,256,535 = 644,256,535
Notice both answers equal 644,256,535
With that explanation out of the way, let's continue. Next, we take the number 644,256,535 and divide it by 2:
644,256,535 ÷ 2 = 322,128,267.5
If the quotient is a whole number, then 2 and 322,128,267.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 644,256,535 | |
| -1 | -644,256,535 |
Now, we try dividing 644,256,535 by 3:
644,256,535 ÷ 3 = 214,752,178.3333
If the quotient is a whole number, then 3 and 214,752,178.3333 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 644,256,535 | |
| -1 | -644,256,535 |
Let's try dividing by 4:
644,256,535 ÷ 4 = 161,064,133.75
If the quotient is a whole number, then 4 and 161,064,133.75 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 644,256,535 | |
| -1 | 644,256,535 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 65 | 317 | 1,585 | 4,121 | 20,605 | 31,267 | 156,335 | 406,471 | 2,032,355 | 9,911,639 | 49,558,195 | 128,851,307 | 644,256,535 |
| -1 | -5 | -13 | -65 | -317 | -1,585 | -4,121 | -20,605 | -31,267 | -156,335 | -406,471 | -2,032,355 | -9,911,639 | -49,558,195 | -128,851,307 | -644,256,535 |
Here are some more numbers to try:
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