78 / 2 = 39
39 / 3 = 13
So the prime fact. is 2 x 3 x 13
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It is: 2*2*7 = 28
It is: 2*5*5*5 = 250
As a product of its prime factors: 2*2*2*17*179 = 24344
84 2 42 3 21 7 84=2^2*3*7
20 / 2 = 10 10 / 2 = 5 so prime factorization is 2 x 2 x 5