Q: What are the prime factors of the number 257,804,768?

 A: 2, 13, 19, 193

Why are those the prime factors of the number 257,804,768?

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 257,804,768

257,804,768
Factor Arrows
2128,902,384
Factor Arrows
264,451,192
Factor Arrows
232,225,596
Factor Arrows
216,112,798
Factor Arrows
28,056,399
Factor Arrows
13619,723
Factor Arrows
1347,671
Factor Arrows
133,667
Factor Arrows
19193

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, 13, 19, 193

We can check our work by multiplying all of the prime factors together: 2 x 2 x 2 x 2 x 2 x 13 x 13 x 13 x 19 x 193 = 257,804,768

This can also be written as 25 x 133 x 191 x 1931 = 257,804,768

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


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