22528915 has 4 divisors (see below), whose sum is σ = 27034704. Its totient is φ = 18023128.

The previous prime is 22528907. The next prime is 22528931. The reversal of 22528915 is 51982522.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51982522 = 2 ⋅25991261.

It is a cyclic number.

It is not a de Polignac number, because 22528915 - 2³ = 22528907 is a prime.

It is a super-2 number, since 2×22528915² = 1015104022154450, which contains 22 as substring.

It is a Duffinian 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, 2252887 + ... + 2252896.

It is an arithmetic number, because the mean of its divisors is an integer number (6758676).

Almost surely, 2^22528915 is an apocalyptic number.

22528915 is a deficient number, since it is larger than the sum of its proper divisors (4505789).

22528915 is an equidigital number, since it uses as much as digits as its factorization.

22528915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4505788.

The product of its digits is 14400, while the sum is 34.

The square root of 22528915 is about 4746.4634202741. The cubic root of 22528915 is about 282.4316904826.

The spelling of 22528915 in words is "twenty-two million, five hundred twenty-eight thousand, nine hundred fifteen".