18028506 has 16 divisors (see below), whose sum is σ = 36114048. Its totient is φ = 6000000.

The previous prime is 18028499. The next prime is 18028519. The reversal of 18028506 is 60582081.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2506 + ... + 6506.

It is an arithmetic number, because the mean of its divisors is an integer number (2257128).

Almost surely, 2^18028506 is an apocalyptic number.

18028506 is an abundant number, since it is smaller than the sum of its proper divisors (18085542).

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

18028506 is a wasteful number, since it uses less digits than its factorization.

18028506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4757.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 18028506 is about 4245.9988224209. The cubic root of 18028506 is about 262.2124124800.

The spelling of 18028506 in words is "eighteen million, twenty-eight thousand, five hundred six".