18330228 has 36 divisors (see below), whose sum is σ = 52954720. Its totient is φ = 5237136.

The previous prime is 18330211. The next prime is 18330229. The reversal of 18330228 is 82203381.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18330229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36118 + ... + 36621.

Almost surely, 2^18330228 is an apocalyptic number.

18330228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18330228 is an abundant number, since it is smaller than the sum of its proper divisors (34624492).

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

18330228 is a wasteful number, since it uses less digits than its factorization.

18330228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72756 (or 72751 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 18330228 is about 4281.3815527234. The cubic root of 18330228 is about 263.6671079629.

The spelling of 18330228 in words is "eighteen million, three hundred thirty thousand, two hundred twenty-eight".