18028228 has 24 divisors (see below), whose sum is σ = 34860672. Its totient is φ = 8114304.

The previous prime is 18028189. The next prime is 18028229. The reversal of 18028228 is 82282081.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18028228.

It is not an unprimeable number, because it can be changed into a prime (18028229) 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, 4200 + ... + 7327.

It is an arithmetic number, because the mean of its divisors is an integer number (1452528).

Almost surely, 2^18028228 is an apocalyptic number.

It is an amenable number.

18028228 is a deficient number, since it is larger than the sum of its proper divisors (16832444).

18028228 is a wasteful number, since it uses less digits than its factorization.

18028228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11571 (or 11569 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 18028228 is about 4245.9660855923. The cubic root of 18028228 is about 262.2110646992.

The spelling of 18028228 in words is "eighteen million, twenty-eight thousand, two hundred twenty-eight".