It is a composite number.
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The prime factors of 780 are: 2,3,5,13
As a product of its prime factors: 2*2*3*5*13 = 780
4, composite. 67, prime.
Prime
1 is special 2 prime 3 prime 4 composite 5 prime 6 composite 7 prime 8 composite 9 composite 10 composite 11 prime 12 composite ext.