22971978 has 32 divisors (see below), whose sum is σ = 51364800. Its totient is φ = 7609968.

The previous prime is 22971967. The next prime is 22971983. The reversal of 22971978 is 87917922.

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, 8113 + ... + 10571.

It is an arithmetic number, because the mean of its divisors is an integer number (1605150).

Almost surely, 2^22971978 is an apocalyptic number.

22971978 is an abundant number, since it is smaller than the sum of its proper divisors (28392822).

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

22971978 is a wasteful number, since it uses less digits than its factorization.

22971978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2643 (or 2637 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 22971978 is about 4792.9091374655. The cubic root of 22971978 is about 284.2711570777.

The spelling of 22971978 in words is "twenty-two million, nine hundred seventy-one thousand, nine hundred seventy-eight".