18868664 has 8 divisors (see below), whose sum is σ = 35378760. Its totient is φ = 9434328.

The previous prime is 18868649. The next prime is 18868669. The reversal of 18868664 is 46686881.

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

It is a super-2 number, since 2×18868664² = 712052962289792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18868669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1179284 + ... + 1179299.

It is an arithmetic number, because the mean of its divisors is an integer number (4422345).

Almost surely, 2^18868664 is an apocalyptic number.

It is an amenable number.

18868664 is a deficient number, since it is larger than the sum of its proper divisors (16510096).

18868664 is a wasteful number, since it uses less digits than its factorization.

18868664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2358589 (or 2358585 counting only the distinct ones).

The product of its digits is 442368, while the sum is 47.

The square root of 18868664 is about 4343.8075463814. The cubic root of 18868664 is about 266.2239055443.

The spelling of 18868664 in words is "eighteen million, eight hundred sixty-eight thousand, six hundred sixty-four".