18046728 has 96 divisors (see below), whose sum is σ = 56871360. Its totient is φ = 5063040.

The previous prime is 18046723. The next prime is 18046739. The reversal of 18046728 is 82764081.

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 = 18046692 and 18046701.

It is not an unprimeable number, because it can be changed into a prime (18046723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30451 + ... + 31037.

It is an arithmetic number, because the mean of its divisors is an integer number (592410).

Almost surely, 2^18046728 is an apocalyptic number.

18046728 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 18046728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28435680).

18046728 is an abundant number, since it is smaller than the sum of its proper divisors (38824632).

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

18046728 is a wasteful number, since it uses less digits than its factorization.

18046728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 18046728 is about 4248.1440653537. The cubic root of 18046728 is about 262.3007249505.

The spelling of 18046728 in words is "eighteen million, forty-six thousand, seven hundred twenty-eight".