18031664 has 20 divisors (see below), whose sum is σ = 39927504. Its totient is φ = 7727808.

The previous prime is 18031633. The next prime is 18031681. The reversal of 18031664 is 46613081.

18031664 = T₂₈₄ + T₂₈₅ + ... + T₅₀₇.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80387 + ... + 80610.

Almost surely, 2^18031664 is an apocalyptic number.

18031664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18031664 is an abundant number, since it is smaller than the sum of its proper divisors (21895840).

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

18031664 is a wasteful number, since it uses less digits than its factorization.

18031664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161012 (or 161006 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 18031664 is about 4246.3706856562. The cubic root of 18031664 is about 262.2277219100.

The spelling of 18031664 in words is "eighteen million, thirty-one thousand, six hundred sixty-four".