A:
Positive:
1 x 817877837 x 1168396911 x 743525377 x 1062179331 x 2470932317 x 352993209 x 254873641 x 22463
Negative:
-1 x -81787783-7 x -11683969-11 x -7435253-77 x -1062179-331 x -247093-2317 x -35299-3209 x -25487-3641 x -22463
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 81,787,783, 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 | 81,787,783 | |
| -1 | -81,787,783 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 81,787,783.
Example:
1 x 81,787,783 = 81,787,783
and
-1 x -81,787,783 = 81,787,783
Notice both answers equal 81,787,783
With that explanation out of the way, let's continue. Next, we take the number 81,787,783 and divide it by 2:
81,787,783 ÷ 2 = 40,893,891.5
If the quotient is a whole number, then 2 and 40,893,891.5 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 | 81,787,783 | |
| -1 | -81,787,783 |
Now, we try dividing 81,787,783 by 3:
81,787,783 ÷ 3 = 27,262,594.3333
If the quotient is a whole number, then 3 and 27,262,594.3333 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 | 81,787,783 | |
| -1 | -81,787,783 |
Let's try dividing by 4:
81,787,783 ÷ 4 = 20,446,945.75
If the quotient is a whole number, then 4 and 20,446,945.75 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 | 81,787,783 | |
| -1 | 81,787,783 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 77 | 331 | 2,317 | 3,209 | 3,641 | 22,463 | 25,487 | 35,299 | 247,093 | 1,062,179 | 7,435,253 | 11,683,969 | 81,787,783 |
| -1 | -7 | -11 | -77 | -331 | -2,317 | -3,209 | -3,641 | -22,463 | -25,487 | -35,299 | -247,093 | -1,062,179 | -7,435,253 | -11,683,969 | -81,787,783 |
Here are some more numbers to try:
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