A:
Positive:
1 x 817132555 x 1634265113 x 628563565 x 125712779 x 1034345395 x 2068691027 x 795655135 x 15913
Negative:
-1 x -81713255-5 x -16342651-13 x -6285635-65 x -1257127-79 x -1034345-395 x -206869-1027 x -79565-5135 x -15913
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 81,713,255, 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 | 81,713,255 | |
| -1 | -81,713,255 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 81,713,255.
Example:
1 x 81,713,255 = 81,713,255
and
-1 x -81,713,255 = 81,713,255
Notice both answers equal 81,713,255
With that explanation out of the way, let's continue. Next, we take the number 81,713,255 and divide it by 2:
81,713,255 ÷ 2 = 40,856,627.5
If the quotient is a whole number, then 2 and 40,856,627.5 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 | 81,713,255 | |
| -1 | -81,713,255 |
Now, we try dividing 81,713,255 by 3:
81,713,255 ÷ 3 = 27,237,751.6667
If the quotient is a whole number, then 3 and 27,237,751.6667 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 | 81,713,255 | |
| -1 | -81,713,255 |
Let's try dividing by 4:
81,713,255 ÷ 4 = 20,428,313.75
If the quotient is a whole number, then 4 and 20,428,313.75 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 | 81,713,255 | |
| -1 | 81,713,255 |
If you did it right, you will end up with this table:
| 1 | 5 | 13 | 65 | 79 | 395 | 1,027 | 5,135 | 15,913 | 79,565 | 206,869 | 1,034,345 | 1,257,127 | 6,285,635 | 16,342,651 | 81,713,255 |
| -1 | -5 | -13 | -65 | -79 | -395 | -1,027 | -5,135 | -15,913 | -79,565 | -206,869 | -1,034,345 | -1,257,127 | -6,285,635 | -16,342,651 | -81,713,255 |
Here are some more numbers to try:
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