18690668 has 6 divisors (see below), whose sum is σ = 32708676. Its totient is φ = 9345332.

The previous prime is 18690641. The next prime is 18690671. The reversal of 18690668 is 86609681.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2336330 + ... + 2336337.

It is an arithmetic number, because the mean of its divisors is an integer number (5451446).

Almost surely, 2^18690668 is an apocalyptic number.

It is an amenable number.

18690668 is a deficient number, since it is larger than the sum of its proper divisors (14018008).

18690668 is a wasteful number, since it uses less digits than its factorization.

18690668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4672671 (or 4672669 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 18690668 is about 4323.2705212605. The cubic root of 18690668 is about 265.3841254974.

The spelling of 18690668 in words is "eighteen million, six hundred ninety thousand, six hundred sixty-eight".