22742778 has 16 divisors (see below), whose sum is σ = 46953216. Its totient is φ = 7336320.

The previous prime is 22742761. The next prime is 22742801. The reversal of 22742778 is 87724722.

It is a happy 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, 60951 + ... + 61322.

It is an arithmetic number, because the mean of its divisors is an integer number (2934576).

Almost surely, 2^22742778 is an apocalyptic number.

22742778 is an abundant number, since it is smaller than the sum of its proper divisors (24210438).

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

22742778 is a wasteful number, since it uses less digits than its factorization.

22742778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122309.

The product of its digits is 87808, while the sum is 39.

The square root of 22742778 is about 4768.9388756829. The cubic root of 22742778 is about 283.3225687567.

The spelling of 22742778 in words is "twenty-two million, seven hundred forty-two thousand, seven hundred seventy-eight".