Any product of 2 prime numbers will have 4 factors. Any Prime number to the 3rd power will have 4 factors.
6, 8, 10, 14, 15, 21, 22, 26, 27, 33, 34, 35, 38, 39, 46, 51, 55, 57, 58, 62, 65, 69, 74, 77, 82, 85, 86, 87, 91, 93, 94, 95
24
60, 72, 84, 90 and 96
6 (1,2,3,6) 10 (1,2,5,10) and 15 (1,3,5,15).
The numbers less than 100 with exactly 6 factors are of the form a2b where a and b are different primes. 12, 18, 20, 28, 44, 45, 50, 52, 63, 68, 75, 76, 92 and 99.
24edit: nonethe smallest number with 12 distinct factors would be2*3*5*7*11*13*17*19*23*29*31*37>>100
4, 9, 25, and 49 are all of the numbers between 1 and 100 having 3 factors.
There are five numbers in that range with 12 factors, but none with exactly eleven.
16 and 81 are the only two.
By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
Each of the 25 prime numbers from 1 to 100 has exactly two factors, 1 and the number itself. The other 75 numbers from 1 to 100 are not prime numbers because none of them have exactly two factors.
4 (4,2,1) 9 (9,3,1) 25 (25,5,1) 49 (49,7,1) i think that is it...
There are a lot more than three! 6 (1,2,3,6) 10 (1,2,5,10) 15 (1,3,5,15)
No numbers between 1 and 100 have exactly eleven factors. 60, 72, 84, 90 and 96 each have twelve factors.
In that range, only 100 has exactly 9 factors.
4, 9, 25 and 49.
Numbers having exactly three factors are the squares of prime numbers. Examples of these numbers greater than 100 are 121, 169, 289, 361, 529, 841, etc.
it's probably 60 that has 12 factors
Just 36.