A:
Positive:
1 x 871228155 x 1742456313 x 670175529 x 300423565 x 1340351145 x 600847377 x 2310951885 x 46219
Negative:
-1 x -87122815-5 x -17424563-13 x -6701755-29 x -3004235-65 x -1340351-145 x -600847-377 x -231095-1885 x -46219
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 87,122,815, 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 | 87,122,815 | |
| -1 | -87,122,815 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 87,122,815.
Example:
1 x 87,122,815 = 87,122,815
and
-1 x -87,122,815 = 87,122,815
Notice both answers equal 87,122,815
With that explanation out of the way, let's continue. Next, we take the number 87,122,815 and divide it by 2:
87,122,815 ÷ 2 = 43,561,407.5
If the quotient is a whole number, then 2 and 43,561,407.5 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 | 87,122,815 | |
| -1 | -87,122,815 |
Now, we try dividing 87,122,815 by 3:
87,122,815 ÷ 3 = 29,040,938.3333
If the quotient is a whole number, then 3 and 29,040,938.3333 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 | 87,122,815 | |
| -1 | -87,122,815 |
Let's try dividing by 4:
87,122,815 ÷ 4 = 21,780,703.75
If the quotient is a whole number, then 4 and 21,780,703.75 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 | 87,122,815 | |
| -1 | 87,122,815 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 29 | 65 | 145 | 377 | 1,885 | 46,219 | 231,095 | 600,847 | 1,340,351 | 3,004,235 | 6,701,755 | 17,424,563 | 87,122,815 |
| -1 | -5 | -13 | -29 | -65 | -145 | -377 | -1,885 | -46,219 | -231,095 | -600,847 | -1,340,351 | -3,004,235 | -6,701,755 | -17,424,563 | -87,122,815 |
Here are some more numbers to try:
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