Itself and one
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because 70 is an even number, and every even number has 2 as a factor.
2 and 7 are prime numbers less than 10 that are factors of 42 and 70.
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.
That's a prime factor.
13 is a prime number. The only prime factor of a prime number is the number itself.