22778856 has 24 divisors (see below), whose sum is σ = 61692930. Its totient is φ = 7592928.

The previous prime is 22778849. The next prime is 22778857. The reversal of 22778856 is 65887722.

It can be written as a sum of positive squares in only one way, i.e., 12320100 + 10458756 = 3510^2 + 3234^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (22778857) 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, 158115 + ... + 158258.

Almost surely, 2^22778856 is an apocalyptic number.

It is an amenable number.

22778856 is an abundant number, since it is smaller than the sum of its proper divisors (38914074).

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

22778856 is a wasteful number, since it uses less digits than its factorization.

22778856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316385 (or 316378 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 22778856 is about 4772.7199792152. The cubic root of 22778856 is about 283.4723058341.

The spelling of 22778856 in words is "twenty-two million, seven hundred seventy-eight thousand, eight hundred fifty-six".