Q: What are the prime factors of the number 406,437,120?

 A: 2, 3, 5, 35281

Why are those the prime factors of the number 406,437,120?

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 406,437,120

406,437,120
Factor Arrows
2203,218,560
Factor Arrows
2101,609,280
Factor Arrows
250,804,640
Factor Arrows
225,402,320
Factor Arrows
212,701,160
Factor Arrows
26,350,580
Factor Arrows
23,175,290
Factor Arrows
21,587,645
Factor Arrows
3529,215
Factor Arrows
3176,405
Factor Arrows
535,281

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, 3, 5, 35281

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 2 x 2 x 3 x 3 x 5 x 35,281 = 406,437,120

This can also be written as 28 x 32 x 51 x 35,2811 = 406,437,120

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


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