18649668 has 24 divisors (see below), whose sum is σ = 45017280. Its totient is φ = 6002080.

The previous prime is 18649649. The next prime is 18649669. The reversal of 18649668 is 86694681.

It is not an unprimeable number, because it can be changed into a prime (18649669) 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, 26448 + ... + 27143.

It is an arithmetic number, because the mean of its divisors is an integer number (1875720).

Almost surely, 2^18649668 is an apocalyptic number.

It is an amenable number.

18649668 is an abundant number, since it is smaller than the sum of its proper divisors (26367612).

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

18649668 is a wasteful number, since it uses less digits than its factorization.

18649668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53627 (or 53625 counting only the distinct ones).

The product of its digits is 497664, while the sum is 48.

The square root of 18649668 is about 4318.5261374687. The cubic root of 18649668 is about 265.1899338490.

The spelling of 18649668 in words is "eighteen million, six hundred forty-nine thousand, six hundred sixty-eight".