Q: What are the factor combinations of the number 78,912,972?

How do I find the factor combinations of the number 78,912,972?

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 78,912,972, 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		78,912,972
-1		-78,912,972

With that explanation out of the way, let's continue. Next, we take the number 78,912,972 and divide it by 2:

78,912,972 ÷ 2 = 39,456,486

If the quotient is a whole number, then 2 and 39,456,486 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!

Here is what our table should look like at this step:

Now, we try dividing 78,912,972 by 3:

78,912,972 ÷ 3 = 26,304,324

If the quotient is a whole number, then 3 and 26,304,324 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!

Here is what our table should look like at this step:

Let's try dividing by 4:

78,912,972 ÷ 4 = 19,728,243

If the quotient is a whole number, then 4 and 19,728,243 are factors. In this case, the quotient is a whole number. Write them in the table inside the other two factors like the below example. Don't forget to write the negative numbers too!

Here is what our table should look like at this step:

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

More Examples

Here are some more numbers to try:

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