A:
Positive:
1 x 7872174655 x 157443493139 x 5663435163 x 4829555695 x 1132687815 x 9659116949 x 11328522657 x 34745
Negative:
-1 x -787217465-5 x -157443493-139 x -5663435-163 x -4829555-695 x -1132687-815 x -965911-6949 x -113285-22657 x -34745
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 787,217,465, 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 | 787,217,465 | |
| -1 | -787,217,465 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 787,217,465.
Example:
1 x 787,217,465 = 787,217,465
and
-1 x -787,217,465 = 787,217,465
Notice both answers equal 787,217,465
With that explanation out of the way, let's continue. Next, we take the number 787,217,465 and divide it by 2:
787,217,465 ÷ 2 = 393,608,732.5
If the quotient is a whole number, then 2 and 393,608,732.5 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 | 787,217,465 | |
| -1 | -787,217,465 |
Now, we try dividing 787,217,465 by 3:
787,217,465 ÷ 3 = 262,405,821.6667
If the quotient is a whole number, then 3 and 262,405,821.6667 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 | 787,217,465 | |
| -1 | -787,217,465 |
Let's try dividing by 4:
787,217,465 ÷ 4 = 196,804,366.25
If the quotient is a whole number, then 4 and 196,804,366.25 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 | 787,217,465 | |
| -1 | 787,217,465 |
If you did it right, you will end up with this table:
| 1 | 5 | 139 | 163 | 695 | 815 | 6,949 | 22,657 | 34,745 | 113,285 | 965,911 | 1,132,687 | 4,829,555 | 5,663,435 | 157,443,493 | 787,217,465 |
| -1 | -5 | -139 | -163 | -695 | -815 | -6,949 | -22,657 | -34,745 | -113,285 | -965,911 | -1,132,687 | -4,829,555 | -5,663,435 | -157,443,493 | -787,217,465 |
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