A:
Positive:
1 x 6392755 x 1278557 x 9132513 x 4917525 x 2557135 x 1826565 x 983591 x 7025175 x 3653281 x 2275325 x 1967455 x 1405
Negative:
-1 x -639275-5 x -127855-7 x -91325-13 x -49175-25 x -25571-35 x -18265-65 x -9835-91 x -7025-175 x -3653-281 x -2275-325 x -1967-455 x -1405
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 639,275, 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 | 639,275 | |
| -1 | -639,275 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 639,275.
Example:
1 x 639,275 = 639,275
and
-1 x -639,275 = 639,275
Notice both answers equal 639,275
With that explanation out of the way, let's continue. Next, we take the number 639,275 and divide it by 2:
639,275 ÷ 2 = 319,637.5
If the quotient is a whole number, then 2 and 319,637.5 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 | 639,275 | |
| -1 | -639,275 |
Now, we try dividing 639,275 by 3:
639,275 ÷ 3 = 213,091.6667
If the quotient is a whole number, then 3 and 213,091.6667 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 | 639,275 | |
| -1 | -639,275 |
Let's try dividing by 4:
639,275 ÷ 4 = 159,818.75
If the quotient is a whole number, then 4 and 159,818.75 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 | 639,275 | |
| -1 | 639,275 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 13 | 25 | 35 | 65 | 91 | 175 | 281 | 325 | 455 | 1,405 | 1,967 | 2,275 | 3,653 | 7,025 | 9,835 | 18,265 | 25,571 | 49,175 | 91,325 | 127,855 | 639,275 |
| -1 | -5 | -7 | -13 | -25 | -35 | -65 | -91 | -175 | -281 | -325 | -455 | -1,405 | -1,967 | -2,275 | -3,653 | -7,025 | -9,835 | -18,265 | -25,571 | -49,175 | -91,325 | -127,855 | -639,275 |
Here are some more numbers to try:
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