28531884 has 48 divisors (see below), whose sum is σ = 68947200. Its totient is φ = 9176256.

The previous prime is 28531849. The next prime is 28531907. The reversal of 28531884 is 48813582.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79297 + ... + 79655.

It is an arithmetic number, because the mean of its divisors is an integer number (1436400).

Almost surely, 2^28531884 is an apocalyptic number.

It is an amenable number.

28531884 is an abundant number, since it is smaller than the sum of its proper divisors (40415316).

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

28531884 is a wasteful number, since it uses less digits than its factorization.

28531884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582 (or 580 counting only the distinct ones).

The product of its digits is 61440, while the sum is 39.

The square root of 28531884 is about 5341.5245014883. The cubic root of 28531884 is about 305.5696029587.

The spelling of 28531884 in words is "twenty-eight million, five hundred thirty-one thousand, eight hundred eighty-four".