18312664 has 8 divisors (see below), whose sum is σ = 34336260. Its totient is φ = 9156328.

The previous prime is 18312643. The next prime is 18312673. The reversal of 18312664 is 46621381.

It is a happy number.

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

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, 1144534 + ... + 1144549.

Almost surely, 2^18312664 is an apocalyptic number.

It is an amenable number.

18312664 is a deficient number, since it is larger than the sum of its proper divisors (16023596).

18312664 is a wasteful number, since it uses less digits than its factorization.

18312664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2289089 (or 2289085 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 18312664 is about 4279.3298540776. The cubic root of 18312664 is about 263.5828658933.

It can be divided in two parts, 1831 and 2664, that multiplied together give a palindrome (4877784).

The spelling of 18312664 in words is "eighteen million, three hundred twelve thousand, six hundred sixty-four".