No; it is divisible only by its factors (1, 2, 4, 5, 8, 10, 16, 20, 40, and 80).
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All the even numbers are divisible by 2.
There are 80 such numbers.
There are: 26
Yes. Test a couple numbers divisible by 9--27, 81--and they are all divisible by 3.
5, 7, a bunch of numbers that are odd are not divisible by 3. numbers that are divisible by three can have all their numbers added together and come out with a number that is divisible by 3.