22722228 has 24 divisors (see below), whose sum is σ = 58909760. Its totient is φ = 7574040.

The previous prime is 22722223. The next prime is 22722247. The reversal of 22722228 is 82222722.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22722223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105088 + ... + 105303.

Almost surely, 2^22722228 is an apocalyptic number.

It is an amenable number.

22722228 is an abundant number, since it is smaller than the sum of its proper divisors (36187532).

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

22722228 is a wasteful number, since it uses less digits than its factorization.

22722228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210404 (or 210396 counting only the distinct ones).

The product of its digits is 3584, while the sum is 27.

The square root of 22722228 is about 4766.7838214041. The cubic root of 22722228 is about 283.2372078375.

The spelling of 22722228 in words is "twenty-two million, seven hundred twenty-two thousand, two hundred twenty-eight".