Q: What are the prime factors of the number 305,432,320?

 A: 2, 5, 47, 5077

Why are those the prime factors of the number 305,432,320?

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 305,432,320

305,432,320
Factor Arrows
2152,716,160
Factor Arrows
276,358,080
Factor Arrows
238,179,040
Factor Arrows
219,089,520
Factor Arrows
29,544,760
Factor Arrows
24,772,380
Factor Arrows
22,386,190
Factor Arrows
21,193,095
Factor Arrows
5238,619
Factor Arrows
475,077

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, 47, 5077

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 5 x 47 x 5,077 = 305,432,320

This can also be written as 28 x 51 x 471 x 5,0771 = 305,432,320

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


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