18668624 has 20 divisors (see below), whose sum is σ = 38953236. Its totient is φ = 8616192.

The previous prime is 18668599. The next prime is 18668641. The reversal of 18668624 is 42686681.

It can be written as a sum of positive squares in 2 ways, for example, as 8809024 + 9859600 = 2968^2 + 3140^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44669 + ... + 45084.

Almost surely, 2^18668624 is an apocalyptic number.

It is an amenable number.

18668624 is an abundant number, since it is smaller than the sum of its proper divisors (20284612).

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

18668624 is a wasteful number, since it uses less digits than its factorization.

18668624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89774 (or 89768 counting only the distinct ones).

The product of its digits is 110592, while the sum is 41.

The square root of 18668624 is about 4320.7203103186. The cubic root of 18668624 is about 265.2797520373.

The spelling of 18668624 in words is "eighteen million, six hundred sixty-eight thousand, six hundred twenty-four".