A:
Positive:
1 x 908772137 x 1298245929 x 313369731 x 293152349 x 1854637203 x 447671217 x 418789899 x 1010871421 x 639531519 x 598272063 x 440516293 x 14441
Negative:
-1 x -90877213-7 x -12982459-29 x -3133697-31 x -2931523-49 x -1854637-203 x -447671-217 x -418789-899 x -101087-1421 x -63953-1519 x -59827-2063 x -44051-6293 x -14441
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 90,877,213, 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 | 90,877,213 | |
| -1 | -90,877,213 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 90,877,213.
Example:
1 x 90,877,213 = 90,877,213
and
-1 x -90,877,213 = 90,877,213
Notice both answers equal 90,877,213
With that explanation out of the way, let's continue. Next, we take the number 90,877,213 and divide it by 2:
90,877,213 ÷ 2 = 45,438,606.5
If the quotient is a whole number, then 2 and 45,438,606.5 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 | 90,877,213 | |
| -1 | -90,877,213 |
Now, we try dividing 90,877,213 by 3:
90,877,213 ÷ 3 = 30,292,404.3333
If the quotient is a whole number, then 3 and 30,292,404.3333 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 | 90,877,213 | |
| -1 | -90,877,213 |
Let's try dividing by 4:
90,877,213 ÷ 4 = 22,719,303.25
If the quotient is a whole number, then 4 and 22,719,303.25 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 | 90,877,213 | |
| -1 | 90,877,213 |
If you did it right, you will end up with this table:
| 1 | 7 | 29 | 31 | 49 | 203 | 217 | 899 | 1,421 | 1,519 | 2,063 | 6,293 | 14,441 | 44,051 | 59,827 | 63,953 | 101,087 | 418,789 | 447,671 | 1,854,637 | 2,931,523 | 3,133,697 | 12,982,459 | 90,877,213 |
| -1 | -7 | -29 | -31 | -49 | -203 | -217 | -899 | -1,421 | -1,519 | -2,063 | -6,293 | -14,441 | -44,051 | -59,827 | -63,953 | -101,087 | -418,789 | -447,671 | -1,854,637 | -2,931,523 | -3,133,697 | -12,982,459 | -90,877,213 |
Here are some more numbers to try:
Try the factor calculator