22815872 has 16 divisors (see below), whose sum is σ = 45453750. Its totient is φ = 11407872.

The previous prime is 22815869. The next prime is 22815883. The reversal of 22815872 is 27851822.

It can be written as a sum of positive squares in only one way, i.e., 13719616 + 9096256 = 3704^2 + 3016^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 88997 + ... + 89252.

Almost surely, 2^22815872 is an apocalyptic number.

It is an amenable number.

22815872 is a deficient number, since it is larger than the sum of its proper divisors (22637878).

22815872 is an equidigital number, since it uses as much as digits as its factorization.

22815872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178263 (or 178251 counting only the distinct ones).

The product of its digits is 17920, while the sum is 35.

The square root of 22815872 is about 4776.5962776856. The cubic root of 22815872 is about 283.6257717241.

The spelling of 22815872 in words is "twenty-two million, eight hundred fifteen thousand, eight hundred seventy-two".