22781564 has 24 divisors (see below), whose sum is σ = 45461808. Its totient is φ = 9895680.

The previous prime is 22781543. The next prime is 22781567. The reversal of 22781564 is 46518722.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22781567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12002 + ... + 13769.

It is an arithmetic number, because the mean of its divisors is an integer number (1894242).

Almost surely, 2^22781564 is an apocalyptic number.

It is an amenable number.

22781564 is a deficient number, since it is larger than the sum of its proper divisors (22680244).

22781564 is a wasteful number, since it uses less digits than its factorization.

22781564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25805 (or 25803 counting only the distinct ones).

The product of its digits is 26880, while the sum is 35.

The square root of 22781564 is about 4773.0036664557. The cubic root of 22781564 is about 283.4835386573.

Subtracting from 22781564 its sum of digits (35), we obtain a square (22781529 = 4773²).

The spelling of 22781564 in words is "twenty-two million, seven hundred eighty-one thousand, five hundred sixty-four".