7 is a Prime number on its own so your answer is 7 EXAMPLE : 7 it can't be divided anymore unless decimal points but those don't count.
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7 and 13 are already prime, no factorization required.
The prime factorization of 287 is 7*41.
The prime factorization of 511 is 7 x 73.
The prime factorization for 490 is: 2 x 5 x 7 x 7
Greatest Prime Factor of 70The prime factorization of 70 is 2 X 5 X 7, so the greatest prime factor in the prime factorization of 70 is 7.