18664679 has 8 divisors (see below), whose sum is σ = 20431488. Its totient is φ = 16909560.

The previous prime is 18664673. The next prime is 18664703. The reversal of 18664679 is 97646681.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18664679 - 2¹² = 18660583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18664673) 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, 614 + ... + 6140.

It is an arithmetic number, because the mean of its divisors is an integer number (2553936).

Almost surely, 2^18664679 is an apocalyptic number.

18664679 is a deficient number, since it is larger than the sum of its proper divisors (1766809).

18664679 is a wasteful number, since it uses less digits than its factorization.

18664679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5845.

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

The square root of 18664679 is about 4320.2637650958. The cubic root of 18664679 is about 265.2610646691.

The spelling of 18664679 in words is "eighteen million, six hundred sixty-four thousand, six hundred seventy-nine".