22712778 has 32 divisors (see below), whose sum is σ = 55062720. Its totient is φ = 6882480.

The previous prime is 22712777. The next prime is 22712813. The reversal of 22712778 is 87721722.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (22712777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18525 + ... + 19712.

It is an arithmetic number, because the mean of its divisors is an integer number (1720710).

Almost surely, 2^22712778 is an apocalyptic number.

22712778 is an abundant number, since it is smaller than the sum of its proper divisors (32349942).

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

22712778 is a wasteful number, since it uses less digits than its factorization.

22712778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38259 (or 38253 counting only the distinct ones).

The product of its digits is 21952, while the sum is 36.

The square root of 22712778 is about 4765.7924839422. The cubic root of 22712778 is about 283.1979370002.

The spelling of 22712778 in words is "twenty-two million, seven hundred twelve thousand, seven hundred seventy-eight".