18481768 has 8 divisors (see below), whose sum is σ = 34653330. Its totient is φ = 9240880.

The previous prime is 18481751. The next prime is 18481769. The reversal of 18481768 is 86718481.

It can be written as a sum of positive squares in only one way, i.e., 17994564 + 487204 = 4242^2 + 698^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18481769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1155103 + ... + 1155118.

Almost surely, 2^18481768 is an apocalyptic number.

It is an amenable number.

18481768 is a deficient number, since it is larger than the sum of its proper divisors (16171562).

18481768 is a wasteful number, since it uses less digits than its factorization.

18481768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310227 (or 2310223 counting only the distinct ones).

The product of its digits is 86016, while the sum is 43.

The square root of 18481768 is about 4299.0426841333. The cubic root of 18481768 is about 264.3917126586.

The spelling of 18481768 in words is "eighteen million, four hundred eighty-one thousand, seven hundred sixty-eight".