22528404 has 18 divisors (see below), whose sum is σ = 56946890. Its totient is φ = 7509456.

The previous prime is 22528399. The next prime is 22528409. The reversal of 22528404 is 40482522.

It is a happy number.

22528404 is a `hidden beast` number, since 2 + 252 + 8 + 404 = 666.

It is an interprime number because it is at equal distance from previous prime (22528399) and next prime (22528409).

It can be written as a sum of positive squares in only one way, i.e., 14976900 + 7551504 = 3870^2 + 2748^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22528409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 312859 + ... + 312930.

Almost surely, 2^22528404 is an apocalyptic number.

It is an amenable number.

22528404 is an abundant number, since it is smaller than the sum of its proper divisors (34418486).

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

22528404 is a wasteful number, since it uses less digits than its factorization.

22528404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625799 (or 625794 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 22528404 is about 4746.4095904167. The cubic root of 22528404 is about 282.4295550981.

The spelling of 22528404 in words is "twenty-two million, five hundred twenty-eight thousand, four hundred four".