Q: What are the prime factors of the number 782,231,840?

 A: 2, 5, 13, 23, 83, 197

Why are those the prime factors of the number 782,231,840?

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 782,231,840

782,231,840
Factor Arrows
2391,115,920
Factor Arrows
2195,557,960
Factor Arrows
297,778,980
Factor Arrows
248,889,490
Factor Arrows
224,444,745
Factor Arrows
54,888,949
Factor Arrows
13376,073
Factor Arrows
2316,351
Factor Arrows
83197

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, 13, 23, 83, 197

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 5 x 13 x 23 x 83 x 197 = 782,231,840

This can also be written as 25 x 51 x 131 x 231 x 831 x 1971 = 782,231,840

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


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