A:
Positive:
1 x 123877855 x 247755729 x 42716537 x 334805145 x 85433185 x 669611073 x 115452309 x 5365
Negative:
-1 x -12387785-5 x -2477557-29 x -427165-37 x -334805-145 x -85433-185 x -66961-1073 x -11545-2309 x -5365
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 12,387,785, 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 | 12,387,785 | |
| -1 | -12,387,785 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 12,387,785.
Example:
1 x 12,387,785 = 12,387,785
and
-1 x -12,387,785 = 12,387,785
Notice both answers equal 12,387,785
With that explanation out of the way, let's continue. Next, we take the number 12,387,785 and divide it by 2:
12,387,785 ÷ 2 = 6,193,892.5
If the quotient is a whole number, then 2 and 6,193,892.5 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 | 12,387,785 | |
| -1 | -12,387,785 |
Now, we try dividing 12,387,785 by 3:
12,387,785 ÷ 3 = 4,129,261.6667
If the quotient is a whole number, then 3 and 4,129,261.6667 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 | 12,387,785 | |
| -1 | -12,387,785 |
Let's try dividing by 4:
12,387,785 ÷ 4 = 3,096,946.25
If the quotient is a whole number, then 4 and 3,096,946.25 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 | 12,387,785 | |
| -1 | 12,387,785 |
If you did it right, you will end up with this table:
| 1 | 5 | 29 | 37 | 145 | 185 | 1,073 | 2,309 | 5,365 | 11,545 | 66,961 | 85,433 | 334,805 | 427,165 | 2,477,557 | 12,387,785 |
| -1 | -5 | -29 | -37 | -145 | -185 | -1,073 | -2,309 | -5,365 | -11,545 | -66,961 | -85,433 | -334,805 | -427,165 | -2,477,557 | -12,387,785 |
Here are some more numbers to try:
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