28328972 has 12 divisors (see below), whose sum is σ = 56658000. Its totient is φ = 12140976.

The previous prime is 28328941. The next prime is 28329011. The reversal of 28328972 is 27982382.

28328972 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505847 + ... + 505902.

It is an arithmetic number, because the mean of its divisors is an integer number (4721500).

Almost surely, 2^28328972 is an apocalyptic number.

It is an amenable number.

28328972 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28328972 is a wasteful number, since it uses less digits than its factorization.

28328972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011760 (or 1011758 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The square root of 28328972 is about 5322.4967825260. The cubic root of 28328972 is about 304.8434993935.

The spelling of 28328972 in words is "twenty-eight million, three hundred twenty-eight thousand, nine hundred seventy-two".