22881564 has 18 divisors (see below), whose sum is σ = 57839600. Its totient is φ = 7627176.

The previous prime is 22881563. The next prime is 22881571. The reversal of 22881564 is 46518822.

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

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 635599 = 22881564 / (2 + 2 + 8 + 8 + 1 + 5 + 6 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22881563) 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, 317764 + ... + 317835.

Almost surely, 2^22881564 is an apocalyptic number.

It is an amenable number.

22881564 is an abundant number, since it is smaller than the sum of its proper divisors (34958036).

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

22881564 is a wasteful number, since it uses less digits than its factorization.

22881564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635609 (or 635604 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 22881564 is about 4783.4677797598. The cubic root of 22881564 is about 283.8977182430.

The spelling of 22881564 in words is "twenty-two million, eight hundred eighty-one thousand, five hundred sixty-four".