A:
Positive:
1 x 8157361723 x 354667931 x 2631407191 x 427087599 x 136183713 x 1144094393 x 185695921 x 13777
Negative:
-1 x -81573617-23 x -3546679-31 x -2631407-191 x -427087-599 x -136183-713 x -114409-4393 x -18569-5921 x -13777
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 81,573,617, 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 | 81,573,617 | |
| -1 | -81,573,617 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 81,573,617.
Example:
1 x 81,573,617 = 81,573,617
and
-1 x -81,573,617 = 81,573,617
Notice both answers equal 81,573,617
With that explanation out of the way, let's continue. Next, we take the number 81,573,617 and divide it by 2:
81,573,617 ÷ 2 = 40,786,808.5
If the quotient is a whole number, then 2 and 40,786,808.5 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 | 81,573,617 | |
| -1 | -81,573,617 |
Now, we try dividing 81,573,617 by 3:
81,573,617 ÷ 3 = 27,191,205.6667
If the quotient is a whole number, then 3 and 27,191,205.6667 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 | 81,573,617 | |
| -1 | -81,573,617 |
Let's try dividing by 4:
81,573,617 ÷ 4 = 20,393,404.25
If the quotient is a whole number, then 4 and 20,393,404.25 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 | 81,573,617 | |
| -1 | 81,573,617 |
If you did it right, you will end up with this table:
| 1 | 23 | 31 | 191 | 599 | 713 | 4,393 | 5,921 | 13,777 | 18,569 | 114,409 | 136,183 | 427,087 | 2,631,407 | 3,546,679 | 81,573,617 |
| -1 | -23 | -31 | -191 | -599 | -713 | -4,393 | -5,921 | -13,777 | -18,569 | -114,409 | -136,183 | -427,087 | -2,631,407 | -3,546,679 | -81,573,617 |
Here are some more numbers to try:
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