A:
Positive:
1 x 7868108929 x 2713141131 x 600619139 x 566051149 x 5280613799 x 207114031 x 195194321 x 18209
Negative:
-1 x -78681089-29 x -2713141-131 x -600619-139 x -566051-149 x -528061-3799 x -20711-4031 x -19519-4321 x -18209
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 78,681,089, 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 | 78,681,089 | |
| -1 | -78,681,089 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 78,681,089.
Example:
1 x 78,681,089 = 78,681,089
and
-1 x -78,681,089 = 78,681,089
Notice both answers equal 78,681,089
With that explanation out of the way, let's continue. Next, we take the number 78,681,089 and divide it by 2:
78,681,089 ÷ 2 = 39,340,544.5
If the quotient is a whole number, then 2 and 39,340,544.5 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 | 78,681,089 | |
| -1 | -78,681,089 |
Now, we try dividing 78,681,089 by 3:
78,681,089 ÷ 3 = 26,227,029.6667
If the quotient is a whole number, then 3 and 26,227,029.6667 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 | 78,681,089 | |
| -1 | -78,681,089 |
Let's try dividing by 4:
78,681,089 ÷ 4 = 19,670,272.25
If the quotient is a whole number, then 4 and 19,670,272.25 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 | 78,681,089 | |
| -1 | 78,681,089 |
If you did it right, you will end up with this table:
| 1 | 29 | 131 | 139 | 149 | 3,799 | 4,031 | 4,321 | 18,209 | 19,519 | 20,711 | 528,061 | 566,051 | 600,619 | 2,713,141 | 78,681,089 |
| -1 | -29 | -131 | -139 | -149 | -3,799 | -4,031 | -4,321 | -18,209 | -19,519 | -20,711 | -528,061 | -566,051 | -600,619 | -2,713,141 | -78,681,089 |
Here are some more numbers to try:
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