18288664 has 8 divisors (see below), whose sum is σ = 34291260. Its totient is φ = 9144328.

The previous prime is 18288649. The next prime is 18288689. The reversal of 18288664 is 46688281.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 18288664.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1143034 + ... + 1143049.

Almost surely, 2^18288664 is an apocalyptic number.

It is an amenable number.

18288664 is a deficient number, since it is larger than the sum of its proper divisors (16002596).

18288664 is a wasteful number, since it uses less digits than its factorization.

18288664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2286089 (or 2286085 counting only the distinct ones).

The product of its digits is 147456, while the sum is 43.

The square root of 18288664 is about 4276.5247573234. The cubic root of 18288664 is about 263.4676677561.

The spelling of 18288664 in words is "eighteen million, two hundred eighty-eight thousand, six hundred sixty-four".