18636668 has 12 divisors (see below), whose sum is σ = 32648112. Its totient is φ = 9308640.

The previous prime is 18636661. The next prime is 18636671. The reversal of 18636668 is 86663681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18636661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3521 + ... + 7047.

It is an arithmetic number, because the mean of its divisors is an integer number (2720676).

Almost surely, 2^18636668 is an apocalyptic number.

It is an amenable number.

18636668 is a deficient number, since it is larger than the sum of its proper divisors (14011444).

18636668 is a wasteful number, since it uses less digits than its factorization.

18636668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4852 (or 4850 counting only the distinct ones).

The product of its digits is 248832, while the sum is 44.

The square root of 18636668 is about 4317.0207319400. The cubic root of 18636668 is about 265.1283014652.

The spelling of 18636668 in words is "eighteen million, six hundred thirty-six thousand, six hundred sixty-eight".