18664008 has 48 divisors (see below), whose sum is σ = 51295440. Its totient is φ = 5654880.

The previous prime is 18664007. The next prime is 18664031. The reversal of 18664008 is 80046681.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a self number, because there is not a number n which added to its sum of digits gives 18664008.

It is not an unprimeable number, because it can be changed into a prime (18664007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 310 + ... + 6117.

It is an arithmetic number, because the mean of its divisors is an integer number (1068655).

Almost surely, 2^18664008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18664008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25647720).

18664008 is an abundant number, since it is smaller than the sum of its proper divisors (32631432).

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

18664008 is a wasteful number, since it uses less digits than its factorization.

18664008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6458 (or 6443 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 18664008 is about 4320.1861071023. The cubic root of 18664008 is about 265.2578858966.

The spelling of 18664008 in words is "eighteen million, six hundred sixty-four thousand, eight".