If it has an odd number of factors (greater than 3) then it must be a perfect square that is not the square of a Prime number.
This leaves 42, 62, 82 and 92.
The answer is 82 = 64 which has the factors 64, 32, 16, 8, 4, 2 and 1.
60,72,84,90 and 96 each have twelve factors.
In that range, 180 has the most.
It is one of 5 numbers.
60, 72, 84, 90 and 96 each have twelve factors.
1 is the only number between 1 and 100 that has too few factors to be a prime number.
There aren't any numbers between 1 and 100 with 16 factors.
100
1
36 has nine factors.
1 has the fewest factors.
the number 90 has the most factors under 100
180, which has 18 factors.