The factors of any integer cannot be larger than that integer. So no proper factor of 8 can be 9.
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The factors of 8 are 1, 2, 4, and 8, and the factors of 9 are 1, 3, 9 so the common factor is 1.
8 and 8.
8 has more factors.
8 + 9 = 17
9 to the power of 8 is 9x9x9x9x9x9x9x9=43,046,721