22772778 has 32 divisors (see below), whose sum is σ = 52462080. Its totient is φ = 6455280.

The previous prime is 22772759. The next prime is 22772791. The reversal of 22772778 is 87727722.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 3433 + ... + 7571.

It is an arithmetic number, because the mean of its divisors is an integer number (1639440).

Almost surely, 2^22772778 is an apocalyptic number.

22772778 is an abundant number, since it is smaller than the sum of its proper divisors (29689302).

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

22772778 is a wasteful number, since it uses less digits than its factorization.

22772778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4282.

The product of its digits is 153664, while the sum is 42.

The square root of 22772778 is about 4772.0831929043. The cubic root of 22772778 is about 283.4470909602.

The spelling of 22772778 in words is "twenty-two million, seven hundred seventy-two thousand, seven hundred seventy-eight".