All but the square numbers - 53 of them.
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The least common factor of any set of integers is 1.
the number is 350 the factors is 175 and 2
Not only can they, but they must. An odd number cannot have an even factor. So none of the factors of either of the two odd numbers can be even and so the GCF is made up of only odd factors and so it must be odd.
1 is the number less than fifty with the fewest number of factors. All other numbers have at least two factors (1, and the integer itself).
360, 420 and 480 each have 24 factors.