A:
Positive:
1 x 128406855 x 256813711 x 116733513 x 98774555 x 23346765 x 197549143 x 89795715 x 17959
Negative:
-1 x -12840685-5 x -2568137-11 x -1167335-13 x -987745-55 x -233467-65 x -197549-143 x -89795-715 x -17959
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 12,840,685, 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 | 12,840,685 | |
| -1 | -12,840,685 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 12,840,685.
Example:
1 x 12,840,685 = 12,840,685
and
-1 x -12,840,685 = 12,840,685
Notice both answers equal 12,840,685
With that explanation out of the way, let's continue. Next, we take the number 12,840,685 and divide it by 2:
12,840,685 ÷ 2 = 6,420,342.5
If the quotient is a whole number, then 2 and 6,420,342.5 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 | 12,840,685 | |
| -1 | -12,840,685 |
Now, we try dividing 12,840,685 by 3:
12,840,685 ÷ 3 = 4,280,228.3333
If the quotient is a whole number, then 3 and 4,280,228.3333 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 | 12,840,685 | |
| -1 | -12,840,685 |
Let's try dividing by 4:
12,840,685 ÷ 4 = 3,210,171.25
If the quotient is a whole number, then 4 and 3,210,171.25 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 | 12,840,685 | |
| -1 | 12,840,685 |
If you did it right, you will end up with this table:
| 1 | 5 | 11 | 13 | 55 | 65 | 143 | 715 | 17,959 | 89,795 | 197,549 | 233,467 | 987,745 | 1,167,335 | 2,568,137 | 12,840,685 |
| -1 | -5 | -11 | -13 | -55 | -65 | -143 | -715 | -17,959 | -89,795 | -197,549 | -233,467 | -987,745 | -1,167,335 | -2,568,137 | -12,840,685 |
Here are some more numbers to try:
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