None The even numbers 60, 72, 84, 90, and 96 each have 12 factors
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Perfect squares have odd numbers of factors. The perfect squares less than 100 are: 1,4,9,16,25,36,49,64,81,100. 64 seems to fit both criteria.
the number 90 has the most factors under 100
It is 97 which has only two factors because it is a prime number
The most factors any odd number less than 100 has is 6. There are 4 numbers which have 6 factors:45, 63, 75 & 99.
60, 72, 84, 90 and 96 each have twelve factors.