Q: What are the factor combinations of the number 387,367,129?

 A:
Positive:   1 x 387367129271 x 1429399
Negative: -1 x -387367129-271 x -1429399


How do I find the factor combinations of the number 387,367,129?

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 387,367,129, it is easier to work with a table - it's called factoring from the outside in.

Outside in Factoring

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.

1 387,367,129
-1 -387,367,129

Why are the negative numbers included?

When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 387,367,129.

Example:
1 x 387,367,129 = 387,367,129
and
-1 x -387,367,129 = 387,367,129
Notice both answers equal 387,367,129

With that explanation out of the way, let's continue. Next, we take the number 387,367,129 and divide it by 2:

387,367,129 ÷ 2 = 193,683,564.5

If the quotient is a whole number, then 2 and 193,683,564.5 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:

1 387,367,129
-1 -387,367,129

Now, we try dividing 387,367,129 by 3:

387,367,129 ÷ 3 = 129,122,376.3333

If the quotient is a whole number, then 3 and 129,122,376.3333 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:

1 387,367,129
-1 -387,367,129

Let's try dividing by 4:

387,367,129 ÷ 4 = 96,841,782.25

If the quotient is a whole number, then 4 and 96,841,782.25 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:

1 387,367,129
-1 387,367,129
Keep dividing by the next highest number until you cannot divide anymore.

If you did it right, you will end up with this table:

12711,429,399387,367,129
-1-271-1,429,399-387,367,129

More Examples

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