26
14
The number 9: factors are 9, 3, and 1.
9 The three factors are 1, 3, and 9. 9 The three factors are 1, 3, and 9.
There is no such number. Any prime number raised to the third power has exactly four factors. For example, 23 = 8; its factors are 1, 2, 4, 8 (1, 2, 22, 23). Since - as is well-known - there is no largest prime number, there is no largest number that has exactly four factors.
The Answer Is Actually 26 not 24 Because The Factors Of 24 Are: 1,2,4,6,12 and 24 Where as 26 Has: 1,2,13, 26!
48 has ten factors, 60 and 72 have twelve apiece, 80 is the next one with exactly ten.
The next square number after ten (which is not a square number) is 16. Sixteen has five factors.
9
The number is 105 (3 x 5 x 7). The next number that is the product of 3 odd primes is 165 (3 x 5 x 11).
169
You Round up to the next higher number
A perfect number is a number that is the sum of all its proper factors (that is all its factors excluding itself). The next perfect number after 28 is 496