A:
Positive:
1 x 816152055 x 163230417 x 1165931535 x 2331863653 x 1249853265 x 249973571 x 228554571 x 17855
Negative:
-1 x -81615205-5 x -16323041-7 x -11659315-35 x -2331863-653 x -124985-3265 x -24997-3571 x -22855-4571 x -17855
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 81,615,205, 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 | 81,615,205 | |
| -1 | -81,615,205 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 81,615,205.
Example:
1 x 81,615,205 = 81,615,205
and
-1 x -81,615,205 = 81,615,205
Notice both answers equal 81,615,205
With that explanation out of the way, let's continue. Next, we take the number 81,615,205 and divide it by 2:
81,615,205 ÷ 2 = 40,807,602.5
If the quotient is a whole number, then 2 and 40,807,602.5 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 | 81,615,205 | |
| -1 | -81,615,205 |
Now, we try dividing 81,615,205 by 3:
81,615,205 ÷ 3 = 27,205,068.3333
If the quotient is a whole number, then 3 and 27,205,068.3333 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 | 81,615,205 | |
| -1 | -81,615,205 |
Let's try dividing by 4:
81,615,205 ÷ 4 = 20,403,801.25
If the quotient is a whole number, then 4 and 20,403,801.25 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 | 81,615,205 | |
| -1 | 81,615,205 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 653 | 3,265 | 3,571 | 4,571 | 17,855 | 22,855 | 24,997 | 124,985 | 2,331,863 | 11,659,315 | 16,323,041 | 81,615,205 |
| -1 | -5 | -7 | -35 | -653 | -3,265 | -3,571 | -4,571 | -17,855 | -22,855 | -24,997 | -124,985 | -2,331,863 | -11,659,315 | -16,323,041 | -81,615,205 |
Here are some more numbers to try:
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