Q: What are the prime factors of the number 273,385,728?

 A: 2, 3, 7, 11, 23, 67

Why are those the prime factors of the number 273,385,728?

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 273,385,728

273,385,728
Factor Arrows
2136,692,864
Factor Arrows
268,346,432
Factor Arrows
234,173,216
Factor Arrows
217,086,608
Factor Arrows
28,543,304
Factor Arrows
24,271,652
Factor Arrows
22,135,826
Factor Arrows
21,067,913
Factor Arrows
3355,971
Factor Arrows
3118,657
Factor Arrows
716,951
Factor Arrows
111,541
Factor Arrows
2367

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, 7, 11, 23, 67

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 7 x 11 x 23 x 67 = 273,385,728

This can also be written as 28 x 32 x 71 x 111 x 231 x 671 = 273,385,728

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


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