18505768 has 16 divisors (see below), whose sum is σ = 34768980. Its totient is φ = 9234048.

The previous prime is 18505759. The next prime is 18505769. The reversal of 18505768 is 86750581.

It can be written as a sum of positive squares in 2 ways, for example, as 12945604 + 5560164 = 3598^2 + 2358^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18505768.

It is not an unprimeable number, because it can be changed into a prime (18505769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2380 + ... + 6532.

Almost surely, 2^18505768 is an apocalyptic number.

It is an amenable number.

18505768 is a deficient number, since it is larger than the sum of its proper divisors (16263212).

18505768 is a wasteful number, since it uses less digits than its factorization.

18505768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4716 (or 4712 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 40.

The square root of 18505768 is about 4301.8330976457. The cubic root of 18505768 is about 264.5061074939.

The spelling of 18505768 in words is "eighteen million, five hundred five thousand, seven hundred sixty-eight".