28509924 has 24 divisors (see below), whose sum is σ = 68146848. Its totient is φ = 9271360.

The previous prime is 28509917. The next prime is 28509941. The reversal of 28509924 is 42990582.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28482 + ... + 29465.

It is an arithmetic number, because the mean of its divisors is an integer number (2839452).

Almost surely, 2^28509924 is an apocalyptic number.

It is an amenable number.

28509924 is an abundant number, since it is smaller than the sum of its proper divisors (39636924).

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

28509924 is a wasteful number, since it uses less digits than its factorization.

28509924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57995 (or 57993 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 28509924 is about 5339.4685128765. The cubic root of 28509924 is about 305.4911874011.

The spelling of 28509924 in words is "twenty-eight million, five hundred nine thousand, nine hundred twenty-four".