22278556 has 12 divisors (see below), whose sum is σ = 39130168. Its totient is φ = 11098512.

The previous prime is 22278499. The next prime is 22278563. The reversal of 22278556 is 65587222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8946 + ... + 11161.

Almost surely, 2^22278556 is an apocalyptic number.

It is an amenable number.

22278556 is a deficient number, since it is larger than the sum of its proper divisors (16851612).

22278556 is a wasteful number, since it uses less digits than its factorization.

22278556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20388 (or 20386 counting only the distinct ones).

The product of its digits is 67200, while the sum is 37.

The square root of 22278556 is about 4720.0165253948. The cubic root of 22278556 is about 281.3815900440.

The spelling of 22278556 in words is "twenty-two million, two hundred seventy-eight thousand, five hundred fifty-six".