A:
Positive:
1 x 126386055 x 25277217 x 180551535 x 361103193 x 65485965 x 130971351 x 93551871 x 6755
Negative:
-1 x -12638605-5 x -2527721-7 x -1805515-35 x -361103-193 x -65485-965 x -13097-1351 x -9355-1871 x -6755
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 12,638,605, 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 | 12,638,605 | |
| -1 | -12,638,605 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 12,638,605.
Example:
1 x 12,638,605 = 12,638,605
and
-1 x -12,638,605 = 12,638,605
Notice both answers equal 12,638,605
With that explanation out of the way, let's continue. Next, we take the number 12,638,605 and divide it by 2:
12,638,605 ÷ 2 = 6,319,302.5
If the quotient is a whole number, then 2 and 6,319,302.5 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 | 12,638,605 | |
| -1 | -12,638,605 |
Now, we try dividing 12,638,605 by 3:
12,638,605 ÷ 3 = 4,212,868.3333
If the quotient is a whole number, then 3 and 4,212,868.3333 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 | 12,638,605 | |
| -1 | -12,638,605 |
Let's try dividing by 4:
12,638,605 ÷ 4 = 3,159,651.25
If the quotient is a whole number, then 4 and 3,159,651.25 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 | 12,638,605 | |
| -1 | 12,638,605 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 193 | 965 | 1,351 | 1,871 | 6,755 | 9,355 | 13,097 | 65,485 | 361,103 | 1,805,515 | 2,527,721 | 12,638,605 |
| -1 | -5 | -7 | -35 | -193 | -965 | -1,351 | -1,871 | -6,755 | -9,355 | -13,097 | -65,485 | -361,103 | -1,805,515 | -2,527,721 | -12,638,605 |
Here are some more numbers to try:
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