Q: What are the prime factors of the number 258,845,840?

 A: 2, 5, 11, 107, 2749

Why are those the prime factors of the number 258,845,840?

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 258,845,840

258,845,840
Factor Arrows
2129,422,920
Factor Arrows
264,711,460
Factor Arrows
232,355,730
Factor Arrows
216,177,865
Factor Arrows
53,235,573
Factor Arrows
11294,143
Factor Arrows
1072,749

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, 11, 107, 2749

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 5 x 11 x 107 x 2,749 = 258,845,840

This can also be written as 24 x 51 x 111 x 1071 x 2,7491 = 258,845,840

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


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