22724864 has 36 divisors (see below), whose sum is σ = 46940460. Its totient is φ = 10967040.

The previous prime is 22724843. The next prime is 22724887. The reversal of 22724864 is 46842722.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17707264 + 5017600 = 4208^2 + 2240^2 .

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, 5894 + ... + 8954.

Almost surely, 2^22724864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22724864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23470230).

22724864 is an abundant number, since it is smaller than the sum of its proper divisors (24215596).

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

22724864 is an equidigital number, since it uses as much as digits as its factorization.

22724864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3106 (or 3092 counting only the distinct ones).

The product of its digits is 43008, while the sum is 35.

The square root of 22724864 is about 4767.0603100863. The cubic root of 22724864 is about 283.2481601733.

The spelling of 22724864 in words is "twenty-two million, seven hundred twenty-four thousand, eight hundred sixty-four".