A:
Positive:
1 x 15686772117 x 922751397 x 1617193251 x 624971379 x 4138991649 x 951294267 x 367636443 x 24347
Negative:
-1 x -156867721-17 x -9227513-97 x -1617193-251 x -624971-379 x -413899-1649 x -95129-4267 x -36763-6443 x -24347
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 156,867,721, 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 | 156,867,721 | |
| -1 | -156,867,721 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 156,867,721.
Example:
1 x 156,867,721 = 156,867,721
and
-1 x -156,867,721 = 156,867,721
Notice both answers equal 156,867,721
With that explanation out of the way, let's continue. Next, we take the number 156,867,721 and divide it by 2:
156,867,721 ÷ 2 = 78,433,860.5
If the quotient is a whole number, then 2 and 78,433,860.5 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 | 156,867,721 | |
| -1 | -156,867,721 |
Now, we try dividing 156,867,721 by 3:
156,867,721 ÷ 3 = 52,289,240.3333
If the quotient is a whole number, then 3 and 52,289,240.3333 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 | 156,867,721 | |
| -1 | -156,867,721 |
Let's try dividing by 4:
156,867,721 ÷ 4 = 39,216,930.25
If the quotient is a whole number, then 4 and 39,216,930.25 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 | 156,867,721 | |
| -1 | 156,867,721 |
If you did it right, you will end up with this table:
| 1 | 17 | 97 | 251 | 379 | 1,649 | 4,267 | 6,443 | 24,347 | 36,763 | 95,129 | 413,899 | 624,971 | 1,617,193 | 9,227,513 | 156,867,721 |
| -1 | -17 | -97 | -251 | -379 | -1,649 | -4,267 | -6,443 | -24,347 | -36,763 | -95,129 | -413,899 | -624,971 | -1,617,193 | -9,227,513 | -156,867,721 |
Here are some more numbers to try:
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