A:
Positive:
1 x 1385723577 x 1979605111 x 1259748777 x 179964197 x 1428581679 x 2040831067 x 1298717469 x 18553
Negative:
-1 x -138572357-7 x -19796051-11 x -12597487-77 x -1799641-97 x -1428581-679 x -204083-1067 x -129871-7469 x -18553
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 138,572,357, 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 | 138,572,357 | |
| -1 | -138,572,357 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 138,572,357.
Example:
1 x 138,572,357 = 138,572,357
and
-1 x -138,572,357 = 138,572,357
Notice both answers equal 138,572,357
With that explanation out of the way, let's continue. Next, we take the number 138,572,357 and divide it by 2:
138,572,357 ÷ 2 = 69,286,178.5
If the quotient is a whole number, then 2 and 69,286,178.5 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 | 138,572,357 | |
| -1 | -138,572,357 |
Now, we try dividing 138,572,357 by 3:
138,572,357 ÷ 3 = 46,190,785.6667
If the quotient is a whole number, then 3 and 46,190,785.6667 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 | 138,572,357 | |
| -1 | -138,572,357 |
Let's try dividing by 4:
138,572,357 ÷ 4 = 34,643,089.25
If the quotient is a whole number, then 4 and 34,643,089.25 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 | 138,572,357 | |
| -1 | 138,572,357 |
If you did it right, you will end up with this table:
| 1 | 7 | 11 | 77 | 97 | 679 | 1,067 | 7,469 | 18,553 | 129,871 | 204,083 | 1,428,581 | 1,799,641 | 12,597,487 | 19,796,051 | 138,572,357 |
| -1 | -7 | -11 | -77 | -97 | -679 | -1,067 | -7,469 | -18,553 | -129,871 | -204,083 | -1,428,581 | -1,799,641 | -12,597,487 | -19,796,051 | -138,572,357 |
Here are some more numbers to try:
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