22218978 has 32 divisors (see below), whose sum is σ = 45769536. Its totient is φ = 7187648.

The previous prime is 22218941. The next prime is 22218997. The reversal of 22218978 is 87981222.

It is a Curzon number.

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, 33700 + ... + 34352.

It is an arithmetic number, because the mean of its divisors is an integer number (1430298).

Almost surely, 2^22218978 is an apocalyptic number.

22218978 is an abundant number, since it is smaller than the sum of its proper divisors (23550558).

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

22218978 is a wasteful number, since it uses less digits than its factorization.

22218978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818.

The product of its digits is 32256, while the sum is 39.

The square root of 22218978 is about 4713.7010936206. The cubic root of 22218978 is about 281.1305396864.

The spelling of 22218978 in words is "twenty-two million, two hundred eighteen thousand, nine hundred seventy-eight".