18235664 has 20 divisors (see below), whose sum is σ = 36550860. Its totient is φ = 8803200.

The previous prime is 18235643. The next prime is 18235667. The reversal of 18235664 is 46653281.

It can be written as a sum of positive squares in 2 ways, for example, as 7398400 + 10837264 = 2720^2 + 3292^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18235667) 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 in 3 ways as a sum of consecutive naturals, for example, 19187 + ... + 20114.

It is an arithmetic number, because the mean of its divisors is an integer number (1827543).

Almost surely, 2^18235664 is an apocalyptic number.

It is an amenable number.

18235664 is an abundant number, since it is smaller than the sum of its proper divisors (18315196).

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

18235664 is a wasteful number, since it uses less digits than its factorization.

18235664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39338 (or 39332 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 18235664 is about 4270.3236411307. The cubic root of 18235664 is about 263.2129143739.

The spelling of 18235664 in words is "eighteen million, two hundred thirty-five thousand, six hundred sixty-four".