Q: What are the prime factors of the number 539,840?

 A: 2, 5, 7, 241

Why are those the prime factors of the number 539,840?

Prime factors are the prime numbers that can be multipled together to equal the original number. You find the factors by dividing by prime numbers. It is best shown by creating a Factor Tree.

Factor Tree for the number 539,840

539,840
Factor Arrows
2269,920
Factor Arrows
2134,960
Factor Arrows
267,480
Factor Arrows
233,740
Factor Arrows
216,870
Factor Arrows
28,435
Factor Arrows
51,687
Factor Arrows
7241

The numbers in bold above are the prime factors. If there are multiples, you only count them one time. This leads us to our prime factors of:

2, 5, 7, 241

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 2 x 5 x 7 x 241 = 539,840

This can also be written as 26 x 51 x 71 x 2411 = 539,840

If you would like to know more, or need additional explanation, please review our prime factorization explanation.


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