18657668 has 12 divisors (see below), whose sum is σ = 32750172. Its totient is φ = 9300480.

The previous prime is 18657649. The next prime is 18657679. The reversal of 18657668 is 86675681.

It can be written as a sum of positive squares in 2 ways, for example, as 5466244 + 13191424 = 2338^2 + 3632^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5573 + ... + 8268.

It is an arithmetic number, because the mean of its divisors is an integer number (2729181).

Almost surely, 2^18657668 is an apocalyptic number.

It is an amenable number.

18657668 is a deficient number, since it is larger than the sum of its proper divisors (14092504).

18657668 is a wasteful number, since it uses less digits than its factorization.

18657668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14182 (or 14180 counting only the distinct ones).

The product of its digits is 483840, while the sum is 47.

The square root of 18657668 is about 4319.4522800929. The cubic root of 18657668 is about 265.2278472351.

The spelling of 18657668 in words is "eighteen million, six hundred fifty-seven thousand, six hundred sixty-eight".