A:
Positive:
1 x 7572825711 x 688438731 x 2442847137 x 552761341 x 2220771507 x 502511621 x 467174247 x 17831
Negative:
-1 x -75728257-11 x -6884387-31 x -2442847-137 x -552761-341 x -222077-1507 x -50251-1621 x -46717-4247 x -17831
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 75,728,257, 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 | 75,728,257 | |
| -1 | -75,728,257 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 75,728,257.
Example:
1 x 75,728,257 = 75,728,257
and
-1 x -75,728,257 = 75,728,257
Notice both answers equal 75,728,257
With that explanation out of the way, let's continue. Next, we take the number 75,728,257 and divide it by 2:
75,728,257 ÷ 2 = 37,864,128.5
If the quotient is a whole number, then 2 and 37,864,128.5 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 | 75,728,257 | |
| -1 | -75,728,257 |
Now, we try dividing 75,728,257 by 3:
75,728,257 ÷ 3 = 25,242,752.3333
If the quotient is a whole number, then 3 and 25,242,752.3333 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 | 75,728,257 | |
| -1 | -75,728,257 |
Let's try dividing by 4:
75,728,257 ÷ 4 = 18,932,064.25
If the quotient is a whole number, then 4 and 18,932,064.25 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 | 75,728,257 | |
| -1 | 75,728,257 |
If you did it right, you will end up with this table:
| 1 | 11 | 31 | 137 | 341 | 1,507 | 1,621 | 4,247 | 17,831 | 46,717 | 50,251 | 222,077 | 552,761 | 2,442,847 | 6,884,387 | 75,728,257 |
| -1 | -11 | -31 | -137 | -341 | -1,507 | -1,621 | -4,247 | -17,831 | -46,717 | -50,251 | -222,077 | -552,761 | -2,442,847 | -6,884,387 | -75,728,257 |
Here are some more numbers to try:
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