A:
Positive:
1 x 312878155 x 625756313 x 240675561 x 51291565 x 481351169 x 185135305 x 102583607 x 51545793 x 39455845 x 370273035 x 103093965 x 7891
Negative:
-1 x -31287815-5 x -6257563-13 x -2406755-61 x -512915-65 x -481351-169 x -185135-305 x -102583-607 x -51545-793 x -39455-845 x -37027-3035 x -10309-3965 x -7891
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 31,287,815, 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 | 31,287,815 | |
| -1 | -31,287,815 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 31,287,815.
Example:
1 x 31,287,815 = 31,287,815
and
-1 x -31,287,815 = 31,287,815
Notice both answers equal 31,287,815
With that explanation out of the way, let's continue. Next, we take the number 31,287,815 and divide it by 2:
31,287,815 ÷ 2 = 15,643,907.5
If the quotient is a whole number, then 2 and 15,643,907.5 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 | 31,287,815 | |
| -1 | -31,287,815 |
Now, we try dividing 31,287,815 by 3:
31,287,815 ÷ 3 = 10,429,271.6667
If the quotient is a whole number, then 3 and 10,429,271.6667 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 | 31,287,815 | |
| -1 | -31,287,815 |
Let's try dividing by 4:
31,287,815 ÷ 4 = 7,821,953.75
If the quotient is a whole number, then 4 and 7,821,953.75 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 | 31,287,815 | |
| -1 | 31,287,815 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 61 | 65 | 169 | 305 | 607 | 793 | 845 | 3,035 | 3,965 | 7,891 | 10,309 | 37,027 | 39,455 | 51,545 | 102,583 | 185,135 | 481,351 | 512,915 | 2,406,755 | 6,257,563 | 31,287,815 |
| -1 | -5 | -13 | -61 | -65 | -169 | -305 | -607 | -793 | -845 | -3,035 | -3,965 | -7,891 | -10,309 | -37,027 | -39,455 | -51,545 | -102,583 | -185,135 | -481,351 | -512,915 | -2,406,755 | -6,257,563 | -31,287,815 |
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