A:
Positive:
1 x 8129126317 x 478183929 x 2803147181 x 449123493 x 164891911 x 892333077 x 264195249 x 15487
Negative:
-1 x -81291263-17 x -4781839-29 x -2803147-181 x -449123-493 x -164891-911 x -89233-3077 x -26419-5249 x -15487
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 81,291,263, 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 | 81,291,263 | |
| -1 | -81,291,263 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 81,291,263.
Example:
1 x 81,291,263 = 81,291,263
and
-1 x -81,291,263 = 81,291,263
Notice both answers equal 81,291,263
With that explanation out of the way, let's continue. Next, we take the number 81,291,263 and divide it by 2:
81,291,263 ÷ 2 = 40,645,631.5
If the quotient is a whole number, then 2 and 40,645,631.5 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 | 81,291,263 | |
| -1 | -81,291,263 |
Now, we try dividing 81,291,263 by 3:
81,291,263 ÷ 3 = 27,097,087.6667
If the quotient is a whole number, then 3 and 27,097,087.6667 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 | 81,291,263 | |
| -1 | -81,291,263 |
Let's try dividing by 4:
81,291,263 ÷ 4 = 20,322,815.75
If the quotient is a whole number, then 4 and 20,322,815.75 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 | 81,291,263 | |
| -1 | 81,291,263 |
If you did it right, you will end up with this table:
| 1 | 17 | 29 | 181 | 493 | 911 | 3,077 | 5,249 | 15,487 | 26,419 | 89,233 | 164,891 | 449,123 | 2,803,147 | 4,781,839 | 81,291,263 |
| -1 | -17 | -29 | -181 | -493 | -911 | -3,077 | -5,249 | -15,487 | -26,419 | -89,233 | -164,891 | -449,123 | -2,803,147 | -4,781,839 | -81,291,263 |
Here are some more numbers to try:
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