18090788 has 48 divisors (see below), whose sum is σ = 35925120. Its totient is φ = 7924224.

The previous prime is 18090773. The next prime is 18090797. The reversal of 18090788 is 88709081.

It is a super-2 number, since 2×18090788² = 654553220921888, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67118 + ... + 67386.

It is an arithmetic number, because the mean of its divisors is an integer number (748440).

Almost surely, 2^18090788 is an apocalyptic number.

It is an amenable number.

18090788 is a deficient number, since it is larger than the sum of its proper divisors (17834332).

18090788 is a wasteful number, since it uses less digits than its factorization.

18090788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 41.

The square root of 18090788 is about 4253.3266980095. The cubic root of 18090788 is about 262.5140152759.

The spelling of 18090788 in words is "eighteen million, ninety thousand, seven hundred eighty-eight".