18061728 has 24 divisors (see below), whose sum is σ = 47412288. Its totient is φ = 6020544.

The previous prime is 18061721. The next prime is 18061741. The reversal of 18061728 is 82716081.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (18061721) 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, 93976 + ... + 94167.

It is an arithmetic number, because the mean of its divisors is an integer number (1975512).

Almost surely, 2^18061728 is an apocalyptic number.

It is an amenable number.

18061728 is an abundant number, since it is smaller than the sum of its proper divisors (29350560).

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

18061728 is a wasteful number, since it uses less digits than its factorization.

18061728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188156 (or 188148 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 18061728 is about 4249.9091755001. The cubic root of 18061728 is about 262.3733774795.

The spelling of 18061728 in words is "eighteen million, sixty-one thousand, seven hundred twenty-eight".