RE: Another good day20 Aug 2022 01:13
It is a composite number, its proper divisors being 1, 2, 4, 7, and 14. Twenty-eight is the second perfect number - it's the sum of its divisors: 1+2+4+7+14. As a perfect number, it is related to the Mersenne prime 7, since 2(23 - 1) = 28. The next perfect number is 496, the previous being 6.