18930664 has 32 divisors (see below), whose sum is σ = 36717120. Its totient is φ = 9144576.

The previous prime is 18930661. The next prime is 18930683. The reversal of 18930664 is 46603981.

18930664 = 352² + 353² + ... + 464².

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18930661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38629 + ... + 39115.

It is an arithmetic number, because the mean of its divisors is an integer number (1147410).

Almost surely, 2^18930664 is an apocalyptic number.

It is an amenable number.

18930664 is a deficient number, since it is larger than the sum of its proper divisors (17786456).

18930664 is a wasteful number, since it uses less digits than its factorization.

18930664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649 (or 645 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 18930664 is about 4350.9382896106. The cubic root of 18930664 is about 266.5151792374.

The spelling of 18930664 in words is "eighteen million, nine hundred thirty thousand, six hundred sixty-four".