18109664 has 24 divisors (see below), whose sum is σ = 36415008. Its totient is φ = 8861440.

The previous prime is 18109661. The next prime is 18109667. The reversal of 18109664 is 46690181.

It is an interprime number because it is at equal distance from previous prime (18109661) and next prime (18109667).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18109661) 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, 4517 + ... + 7524.

It is an arithmetic number, because the mean of its divisors is an integer number (1517292).

Almost surely, 2^18109664 is an apocalyptic number.

It is an amenable number.

18109664 is an abundant number, since it is smaller than the sum of its proper divisors (18305344).

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

18109664 is a wasteful number, since it uses less digits than its factorization.

18109664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12098 (or 12090 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 18109664 is about 4255.5450884699. The cubic root of 18109664 is about 262.6052862609.

The spelling of 18109664 in words is "eighteen million, one hundred nine thousand, six hundred sixty-four".