18022228 has 12 divisors (see below), whose sum is σ = 36044512. Its totient is φ = 7723800.

The previous prime is 18022217. The next prime is 18022231. The reversal of 18022228 is 82222081.

18022228 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321798 + ... + 321853.

Almost surely, 2^18022228 is an apocalyptic number.

It is an amenable number.

18022228 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18022228 is a wasteful number, since it uses less digits than its factorization.

18022228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643662 (or 643660 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 18022228 is about 4245.2594738131. The cubic root of 18022228 is about 262.1819725267.

The spelling of 18022228 in words is "eighteen million, twenty-two thousand, two hundred twenty-eight".