A:
Positive:
1 x 6385755 x 1277157 x 9122525 x 2554335 x 1824541 x 1557589 x 7175175 x 3649205 x 3115287 x 2225445 x 1435623 x 1025
Negative:
-1 x -638575-5 x -127715-7 x -91225-25 x -25543-35 x -18245-41 x -15575-89 x -7175-175 x -3649-205 x -3115-287 x -2225-445 x -1435-623 x -1025
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 638,575, 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 | 638,575 | |
| -1 | -638,575 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 638,575.
Example:
1 x 638,575 = 638,575
and
-1 x -638,575 = 638,575
Notice both answers equal 638,575
With that explanation out of the way, let's continue. Next, we take the number 638,575 and divide it by 2:
638,575 ÷ 2 = 319,287.5
If the quotient is a whole number, then 2 and 319,287.5 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 | 638,575 | |
| -1 | -638,575 |
Now, we try dividing 638,575 by 3:
638,575 ÷ 3 = 212,858.3333
If the quotient is a whole number, then 3 and 212,858.3333 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 | 638,575 | |
| -1 | -638,575 |
Let's try dividing by 4:
638,575 ÷ 4 = 159,643.75
If the quotient is a whole number, then 4 and 159,643.75 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 | 638,575 | |
| -1 | 638,575 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 25 | 35 | 41 | 89 | 175 | 205 | 287 | 445 | 623 | 1,025 | 1,435 | 2,225 | 3,115 | 3,649 | 7,175 | 15,575 | 18,245 | 25,543 | 91,225 | 127,715 | 638,575 |
| -1 | -5 | -7 | -25 | -35 | -41 | -89 | -175 | -205 | -287 | -445 | -623 | -1,025 | -1,435 | -2,225 | -3,115 | -3,649 | -7,175 | -15,575 | -18,245 | -25,543 | -91,225 | -127,715 | -638,575 |
Here are some more numbers to try:
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