A:
Positive:
1 x 128705155 x 25741037 x 183864535 x 36772941 x 313915205 x 62783287 x 448451435 x 8969
Negative:
-1 x -12870515-5 x -2574103-7 x -1838645-35 x -367729-41 x -313915-205 x -62783-287 x -44845-1435 x -8969
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 12,870,515, 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 | 12,870,515 | |
| -1 | -12,870,515 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 12,870,515.
Example:
1 x 12,870,515 = 12,870,515
and
-1 x -12,870,515 = 12,870,515
Notice both answers equal 12,870,515
With that explanation out of the way, let's continue. Next, we take the number 12,870,515 and divide it by 2:
12,870,515 ÷ 2 = 6,435,257.5
If the quotient is a whole number, then 2 and 6,435,257.5 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 | 12,870,515 | |
| -1 | -12,870,515 |
Now, we try dividing 12,870,515 by 3:
12,870,515 ÷ 3 = 4,290,171.6667
If the quotient is a whole number, then 3 and 4,290,171.6667 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 | 12,870,515 | |
| -1 | -12,870,515 |
Let's try dividing by 4:
12,870,515 ÷ 4 = 3,217,628.75
If the quotient is a whole number, then 4 and 3,217,628.75 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 | 12,870,515 | |
| -1 | 12,870,515 |
If you did it right, you will end up with this table:
| 1 | 5 | 7 | 35 | 41 | 205 | 287 | 1,435 | 8,969 | 44,845 | 62,783 | 313,915 | 367,729 | 1,838,645 | 2,574,103 | 12,870,515 |
| -1 | -5 | -7 | -35 | -41 | -205 | -287 | -1,435 | -8,969 | -44,845 | -62,783 | -313,915 | -367,729 | -1,838,645 | -2,574,103 | -12,870,515 |
Here are some more numbers to try:
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