18307768 has 8 divisors (see below), whose sum is σ = 34327080. Its totient is φ = 9153880.

The previous prime is 18307753. The next prime is 18307781. The reversal of 18307768 is 86770381.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 18307768.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 1144228 + ... + 1144243.

It is an arithmetic number, because the mean of its divisors is an integer number (4290885).

Almost surely, 2^18307768 is an apocalyptic number.

It is an amenable number.

18307768 is a deficient number, since it is larger than the sum of its proper divisors (16019312).

18307768 is a wasteful number, since it uses less digits than its factorization.

18307768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2288477 (or 2288473 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 18307768 is about 4278.7577636506. The cubic root of 18307768 is about 263.5593736489.

The spelling of 18307768 in words is "eighteen million, three hundred seven thousand, seven hundred sixty-eight".