Q: What are the factor combinations of the number 648,391?

 A:
Positive:   1 x 648391
Negative: -1 x -648391


How do I find the factor combinations of the number 648,391?

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 648,391, 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.

1 648,391
-1 -648,391

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 648,391.

Example:
1 x 648,391 = 648,391
and
-1 x -648,391 = 648,391
Notice both answers equal 648,391

With that explanation out of the way, let's continue. Next, we take the number 648,391 and divide it by 2:

648,391 ÷ 2 = 324,195.5

If the quotient is a whole number, then 2 and 324,195.5 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:

1 648,391
-1 -648,391

Now, we try dividing 648,391 by 3:

648,391 ÷ 3 = 216,130.3333

If the quotient is a whole number, then 3 and 216,130.3333 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:

1 648,391
-1 -648,391

Let's try dividing by 4:

648,391 ÷ 4 = 162,097.75

If the quotient is a whole number, then 4 and 162,097.75 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:

1 648,391
-1 648,391
Keep dividing by the next highest number until you cannot divide anymore.

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

1648,391
-1-648,391

More Examples

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