18116864 has 18 divisors (see below), whose sum is σ = 36163470. Its totient is φ = 9058304.

The previous prime is 18116863. The next prime is 18116869. The reversal of 18116864 is 46861181.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17707264 + 409600 = 4208^2 + 640^2 .

It is a super-2 number, since 2×18116864² = 656441522388992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18116863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35129 + ... + 35640.

Almost surely, 2^18116864 is an apocalyptic number.

It is an amenable number.

18116864 is a deficient number, since it is larger than the sum of its proper divisors (18046606).

18116864 is an frugal number, since it uses more digits than its factorization.

18116864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70785 (or 70771 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 18116864 is about 4256.3909594867. The cubic root of 18116864 is about 262.6400836586.

The spelling of 18116864 in words is "eighteen million, one hundred sixteen thousand, eight hundred sixty-four".