18028788 has 24 divisors (see below), whose sum is σ = 42171360. Its totient is φ = 5994720.

The previous prime is 18028783. The next prime is 18028837. The reversal of 18028788 is 88782081.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18028783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3903 + ... + 7161.

It is an arithmetic number, because the mean of its divisors is an integer number (1757140).

Almost surely, 2^18028788 is an apocalyptic number.

It is an amenable number.

18028788 is an abundant number, since it is smaller than the sum of its proper divisors (24142572).

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

18028788 is a wasteful number, since it uses less digits than its factorization.

18028788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3727 (or 3725 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 42.

The square root of 18028788 is about 4246.0320300252. The cubic root of 18028788 is about 262.2137796392.

The spelling of 18028788 in words is "eighteen million, twenty-eight thousand, seven hundred eighty-eight".