28220924 has 24 divisors (see below), whose sum is σ = 50523648. Its totient is φ = 13789440.

The previous prime is 28220917. The next prime is 28220953. The reversal of 28220924 is 42902282.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36704 + ... + 37464.

It is an arithmetic number, because the mean of its divisors is an integer number (2105152).

Almost surely, 2^28220924 is an apocalyptic number.

It is an amenable number.

28220924 is a deficient number, since it is larger than the sum of its proper divisors (22302724).

28220924 is a wasteful number, since it uses less digits than its factorization.

28220924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965 (or 963 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28220924 is about 5312.3369622041. The cubic root of 28220924 is about 304.4554432518.

The spelling of 28220924 in words is "twenty-eight million, two hundred twenty thousand, nine hundred twenty-four".