22778156 has 6 divisors (see below), whose sum is σ = 39861780. Its totient is φ = 11389076.

The previous prime is 22778153. The next prime is 22778177. The reversal of 22778156 is 65187722.

It is not an unprimeable number, because it can be changed into a prime (22778153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2847266 + ... + 2847273.

It is an arithmetic number, because the mean of its divisors is an integer number (6643630).

Almost surely, 2^22778156 is an apocalyptic number.

It is an amenable number.

22778156 is a deficient number, since it is larger than the sum of its proper divisors (17083624).

22778156 is a wasteful number, since it uses less digits than its factorization.

22778156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5694543 (or 5694541 counting only the distinct ones).

The product of its digits is 47040, while the sum is 38.

The square root of 22778156 is about 4772.6466452064. The cubic root of 22778156 is about 283.4694020791.

The spelling of 22778156 in words is "twenty-two million, seven hundred seventy-eight thousand, one hundred fifty-six".