45, 63, 75 and 99 all have 6.
60, 72, 84, 90 and 96 each have 12 factors.
I'm not too sure but i think that 1 and 10 are both factors. 100 as well.
21
49
100
the number 90 has the most factors under 100
1
I wrote out all the factors of all the numbers from 1 to 100 and counted them.
60,72,84,90 and 96 each have twelve factors.
96 is the greatest number under 100 to have the most factors. Factors for 96 are: 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 96
In that range, 180 has the most.
techincally 0 has the most factors. you can multiply any number you want by 0 to get 0 0x101=0 0x100=0 0x99=0 0x98=0 etc... the factors of 100 are limited to only 9 factors. 1x100=100 2x50=100 4x25=100 5x20=100 10x10=100