16 (1, 2, 4, 8, 16) and 81 (1, 3, 9, 27, 81).
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As a product of its oprime factors: 2*5*7 = 70
The only number that ONLY has two and five as factors is 10, which has two digits, so there are no numbers that are three digits long and ONLY have two and five for factors. However, if you are asking what the largest three digit number that has two and five for factors, it would be the largest three digit number with ten as a factor, as ten the the LCM of two and five, and that would be 390.
130, 260,390,520,650,780,910.1040. So the largest three digit number with factors of '5' & '13' is 910.
5 is a prime number having 1 and 5 as its only factors. It makes no difference to the factors of 5 if the digit 5 is in composite numbers.
It is: 70