18679664 has 20 divisors (see below), whose sum is σ = 36787080. Its totient is φ = 9186240.

The previous prime is 18679663. The next prime is 18679693. The reversal of 18679664 is 46697681.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18679663) by changing a digit.

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, 8594 + ... + 10545.

It is an arithmetic number, because the mean of its divisors is an integer number (1839354).

Almost surely, 2^18679664 is an apocalyptic number.

It is an amenable number.

18679664 is a deficient number, since it is larger than the sum of its proper divisors (18107416).

18679664 is a wasteful number, since it uses less digits than its factorization.

18679664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19208 (or 19202 counting only the distinct ones).

The product of its digits is 435456, while the sum is 47.

The square root of 18679664 is about 4321.9976862557. The cubic root of 18679664 is about 265.3320342576.

The spelling of 18679664 in words is "eighteen million, six hundred seventy-nine thousand, six hundred sixty-four".