18601668 has 18 divisors (see below), whose sum is σ = 47020974. Its totient is φ = 6200544.

The previous prime is 18601651. The next prime is 18601717. The reversal of 18601668 is 86610681.

It can be written as a sum of positive squares in only one way, i.e., 16016004 + 2585664 = 4002^2 + 1608^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 516713 = 18601668 / (1 + 8 + 6 + 0 + 1 + 6 + 6 + 8).

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 5 ways as a sum of consecutive naturals, for example, 258321 + ... + 258392.

Almost surely, 2^18601668 is an apocalyptic number.

18601668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18601668 is an abundant number, since it is smaller than the sum of its proper divisors (28419306).

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

18601668 is a wasteful number, since it uses less digits than its factorization.

18601668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516723 (or 516718 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 18601668 is about 4312.9651053539. The cubic root of 18601668 is about 264.9622255401.

The spelling of 18601668 in words is "eighteen million, six hundred one thousand, six hundred sixty-eight".