18325728 has 144 divisors (see below), whose sum is σ = 58378320. Its totient is φ = 5419008.

The previous prime is 18325691. The next prime is 18325753. The reversal of 18325728 is 82752381.

18325728 is a `hidden beast` number, since 1 + 83 + 2 + 572 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18325692 and 18325701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92926 + ... + 93122.

It is an arithmetic number, because the mean of its divisors is an integer number (405405).

Almost surely, 2^18325728 is an apocalyptic number.

18325728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18325728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29189160).

18325728 is an abundant number, since it is smaller than the sum of its proper divisors (40052592).

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

18325728 is a wasteful number, since it uses less digits than its factorization.

18325728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 238 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 18325728 is about 4280.8559891685. The cubic root of 18325728 is about 263.6455297790.

The spelling of 18325728 in words is "eighteen million, three hundred twenty-five thousand, seven hundred twenty-eight".