A:
Positive:
1 x 8701537911 x 791048937 x 235176767 x 1298737407 x 213797737 x 1180672479 x 351013191 x 27269
Negative:
-1 x -87015379-11 x -7910489-37 x -2351767-67 x -1298737-407 x -213797-737 x -118067-2479 x -35101-3191 x -27269
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 87,015,379, 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 | 87,015,379 | |
| -1 | -87,015,379 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 87,015,379.
Example:
1 x 87,015,379 = 87,015,379
and
-1 x -87,015,379 = 87,015,379
Notice both answers equal 87,015,379
With that explanation out of the way, let's continue. Next, we take the number 87,015,379 and divide it by 2:
87,015,379 ÷ 2 = 43,507,689.5
If the quotient is a whole number, then 2 and 43,507,689.5 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 | 87,015,379 | |
| -1 | -87,015,379 |
Now, we try dividing 87,015,379 by 3:
87,015,379 ÷ 3 = 29,005,126.3333
If the quotient is a whole number, then 3 and 29,005,126.3333 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 | 87,015,379 | |
| -1 | -87,015,379 |
Let's try dividing by 4:
87,015,379 ÷ 4 = 21,753,844.75
If the quotient is a whole number, then 4 and 21,753,844.75 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 | 87,015,379 | |
| -1 | 87,015,379 |
If you did it right, you will end up with this table:
| 1 | 11 | 37 | 67 | 407 | 737 | 2,479 | 3,191 | 27,269 | 35,101 | 118,067 | 213,797 | 1,298,737 | 2,351,767 | 7,910,489 | 87,015,379 |
| -1 | -11 | -37 | -67 | -407 | -737 | -2,479 | -3,191 | -27,269 | -35,101 | -118,067 | -213,797 | -1,298,737 | -2,351,767 | -7,910,489 | -87,015,379 |
Here are some more numbers to try:
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