22012878 has 16 divisors (see below), whose sum is σ = 44104320. Its totient is φ = 7324536.

The previous prime is 22012867. The next prime is 22012897. The reversal of 22012878 is 87821022.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 751 + ... + 6677.

It is an arithmetic number, because the mean of its divisors is an integer number (2756520).

Almost surely, 2^22012878 is an apocalyptic number.

22012878 is an abundant number, since it is smaller than the sum of its proper divisors (22091442).

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

22012878 is a wasteful number, since it uses less digits than its factorization.

22012878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6551.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 22012878 is about 4691.7883583981. The cubic root of 22012878 is about 280.2585961321.

The spelling of 22012878 in words is "twenty-two million, twelve thousand, eight hundred seventy-eight".