22781865 has 16 divisors (see below), whose sum is σ = 36589248. Its totient is φ = 12104256.

The previous prime is 22781833. The next prime is 22781897. The reversal of 22781865 is 56818722.

It is an interprime number because it is at equal distance from previous prime (22781833) and next prime (22781897).

It is not a de Polignac number, because 22781865 - 2⁵ = 22781833 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1414 + ... + 6896.

It is an arithmetic number, because the mean of its divisors is an integer number (2286828).

Almost surely, 2^22781865 is an apocalyptic number.

It is an amenable number.

22781865 is a deficient number, since it is larger than the sum of its proper divisors (13807383).

22781865 is a wasteful number, since it uses less digits than its factorization.

22781865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5768.

The product of its digits is 53760, while the sum is 39.

The square root of 22781865 is about 4773.0351978589. The cubic root of 22781865 is about 283.4847871547.

The spelling of 22781865 in words is "twenty-two million, seven hundred eighty-one thousand, eight hundred sixty-five".