18664668 has 60 divisors (see below), whose sum is σ = 53239032. Its totient is φ = 5654880.

The previous prime is 18664651. The next prime is 18664673. The reversal of 18664668 is 86646681.

18664668 is a `hidden beast` number, since 186 + 6 + 466 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 946 + ... + 6182.

Almost surely, 2^18664668 is an apocalyptic number.

18664668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18664668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26619516).

18664668 is an abundant number, since it is smaller than the sum of its proper divisors (34574364).

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

18664668 is a wasteful number, since it uses less digits than its factorization.

18664668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5264 (or 5253 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 18664668 is about 4320.2624920252. The cubic root of 18664668 is about 265.2610125587.

The spelling of 18664668 in words is "eighteen million, six hundred sixty-four thousand, six hundred sixty-eight".