22528381 has 4 divisors (see below), whose sum is σ = 22551264. Its totient is φ = 22505500.

The previous prime is 22528367. The next prime is 22528391. The reversal of 22528381 is 18382522.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22528381 - 2²³ = 14139773 is a prime.

It is a super-2 number, since 2×22528381² = 1015055900962322, which contains 22 as substring.

It is a Duffinian number.

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 (22528321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9895 + ... + 11956.

It is an arithmetic number, because the mean of its divisors is an integer number (5637816).

Almost surely, 2^22528381 is an apocalyptic number.

It is an amenable number.

22528381 is a deficient number, since it is larger than the sum of its proper divisors (22883).

22528381 is a wasteful number, since it uses less digits than its factorization.

22528381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22882.

The product of its digits is 7680, while the sum is 31.

The square root of 22528381 is about 4746.4071675321. The cubic root of 22528381 is about 282.4294589841.

The spelling of 22528381 in words is "twenty-two million, five hundred twenty-eight thousand, three hundred eighty-one".