18664368 has 80 divisors (see below), whose sum is σ = 51827040. Its totient is φ = 5767168.

The previous prime is 18664367. The next prime is 18664411. The reversal of 18664368 is 86346681.

It is a happy number.

It is a super-3 number, since 3×18664368³ (a number of 23 digits) contains 333 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (18664363) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72496 + ... + 72752.

It is an arithmetic number, because the mean of its divisors is an integer number (647838).

Almost surely, 2^18664368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18664368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25913520).

18664368 is an abundant number, since it is smaller than the sum of its proper divisors (33162672).

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

18664368 is a wasteful number, since it uses less digits than its factorization.

18664368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 368 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 18664368 is about 4320.2277717732. The cubic root of 18664368 is about 265.2595913578.

The spelling of 18664368 in words is "eighteen million, six hundred sixty-four thousand, three hundred sixty-eight".