Q: What are the prime factors of the number 428,032?

 A: 2, 11, 19

Why are those the prime factors of the number 428,032?

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 428,032

428,032
Factor Arrows
2214,016
Factor Arrows
2107,008
Factor Arrows
253,504
Factor Arrows
226,752
Factor Arrows
213,376
Factor Arrows
26,688
Factor Arrows
23,344
Factor Arrows
21,672
Factor Arrows
2836
Factor Arrows
2418
Factor Arrows
2209
Factor Arrows
1119

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, 11, 19

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 2 x 2 x 2 x 11 x 19 = 428,032

This can also be written as 211 x 111 x 191 = 428,032

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


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