22728664 has 16 divisors (see below), whose sum is σ = 48704400. Its totient is φ = 9740832.

The previous prime is 22728659. The next prime is 22728689. The reversal of 22728664 is 46682722.

It is a congruent 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, 202879 + ... + 202990.

It is an arithmetic number, because the mean of its divisors is an integer number (3044025).

Almost surely, 2^22728664 is an apocalyptic number.

It is an amenable number.

22728664 is an abundant number, since it is smaller than the sum of its proper divisors (25975736).

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

22728664 is a wasteful number, since it uses less digits than its factorization.

22728664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405882 (or 405878 counting only the distinct ones).

The product of its digits is 64512, while the sum is 37.

The square root of 22728664 is about 4767.4588619096. The cubic root of 22728664 is about 283.2639473307.

The spelling of 22728664 in words is "twenty-two million, seven hundred twenty-eight thousand, six hundred sixty-four".