18187028 has 24 divisors (see below), whose sum is σ = 34060320. Its totient is φ = 8471520.

The previous prime is 18187027. The next prime is 18187063. The reversal of 18187028 is 82078181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18187027) 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, 2675 + ... + 6597.

It is an arithmetic number, because the mean of its divisors is an integer number (1419180).

Almost surely, 2^18187028 is an apocalyptic number.

It is an amenable number.

18187028 is a deficient number, since it is larger than the sum of its proper divisors (15873292).

18187028 is a wasteful number, since it uses less digits than its factorization.

18187028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4007 (or 4005 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 35.

The square root of 18187028 is about 4264.6251886889. The cubic root of 18187028 is about 262.9787026083.

The spelling of 18187028 in words is "eighteen million, one hundred eighty-seven thousand, twenty-eight".