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Numbers with exactly 6 factors are perfect squares of prime numbers. The prime factorization of a number with exactly 6 factors is in the form ( p^2 ), where ( p ) is a prime number. There are 10 prime numbers less than 30: 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29. So, there are 10 numbers less than 30 that have exactly 6 factors.
How many numbers are in 28
19,23
6 and 28 are perfect numbers less than 50.
There are two answers: 24, 25, 26, 27, 28 and 32, 33, 34, 35, 36. Both of these answers have 5 numbers in them.