Q: What are the factor combinations of the number 621,971?

 A:
Positive:   1 x 6219717 x 88853
Negative: -1 x -621971-7 x -88853


How do I find the factor combinations of the number 621,971?

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 621,971, 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.

1 621,971
-1 -621,971

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 621,971.

Example:
1 x 621,971 = 621,971
and
-1 x -621,971 = 621,971
Notice both answers equal 621,971

With that explanation out of the way, let's continue. Next, we take the number 621,971 and divide it by 2:

621,971 ÷ 2 = 310,985.5

If the quotient is a whole number, then 2 and 310,985.5 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:

1 621,971
-1 -621,971

Now, we try dividing 621,971 by 3:

621,971 ÷ 3 = 207,323.6667

If the quotient is a whole number, then 3 and 207,323.6667 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:

1 621,971
-1 -621,971

Let's try dividing by 4:

621,971 ÷ 4 = 155,492.75

If the quotient is a whole number, then 4 and 155,492.75 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:

1 621,971
-1 621,971
Keep dividing by the next highest number until you cannot divide anymore.

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

1788,853621,971
-1-7-88,853-621,971

More Examples

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