A:
Positive:
1 x 7897678113 x 607513717 x 4645693191 x 413491221 x 3573611871 x 422112483 x 318073247 x 24323
Negative:
-1 x -78976781-13 x -6075137-17 x -4645693-191 x -413491-221 x -357361-1871 x -42211-2483 x -31807-3247 x -24323
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 78,976,781, 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 | 78,976,781 | |
| -1 | -78,976,781 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 78,976,781.
Example:
1 x 78,976,781 = 78,976,781
and
-1 x -78,976,781 = 78,976,781
Notice both answers equal 78,976,781
With that explanation out of the way, let's continue. Next, we take the number 78,976,781 and divide it by 2:
78,976,781 ÷ 2 = 39,488,390.5
If the quotient is a whole number, then 2 and 39,488,390.5 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 | 78,976,781 | |
| -1 | -78,976,781 |
Now, we try dividing 78,976,781 by 3:
78,976,781 ÷ 3 = 26,325,593.6667
If the quotient is a whole number, then 3 and 26,325,593.6667 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 | 78,976,781 | |
| -1 | -78,976,781 |
Let's try dividing by 4:
78,976,781 ÷ 4 = 19,744,195.25
If the quotient is a whole number, then 4 and 19,744,195.25 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 | 78,976,781 | |
| -1 | 78,976,781 |
If you did it right, you will end up with this table:
| 1 | 13 | 17 | 191 | 221 | 1,871 | 2,483 | 3,247 | 24,323 | 31,807 | 42,211 | 357,361 | 413,491 | 4,645,693 | 6,075,137 | 78,976,781 |
| -1 | -13 | -17 | -191 | -221 | -1,871 | -2,483 | -3,247 | -24,323 | -31,807 | -42,211 | -357,361 | -413,491 | -4,645,693 | -6,075,137 | -78,976,781 |
Here are some more numbers to try:
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