18677664 has 36 divisors (see below), whose sum is σ = 53115426. Its totient is φ = 6225792.

The previous prime is 18677639. The next prime is 18677669. The reversal of 18677664 is 46677681.

It can be written as a sum of positive squares in only one way, i.e., 13749264 + 4928400 = 3708^2 + 2220^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (18677669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32139 + ... + 32714.

Almost surely, 2^18677664 is an apocalyptic number.

It is an amenable number.

18677664 is an abundant number, since it is smaller than the sum of its proper divisors (34437762).

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

18677664 is a wasteful number, since it uses less digits than its factorization.

18677664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64869 (or 64858 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 18677664 is about 4321.7663055746. The cubic root of 18677664 is about 265.3225643691.

The spelling of 18677664 in words is "eighteen million, six hundred seventy-seven thousand, six hundred sixty-four".