18265728 has 64 divisors (see below), whose sum is σ = 52264800. Its totient is φ = 5618688.

The previous prime is 18265721. The next prime is 18265729. The reversal of 18265728 is 82756281.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (18265721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3163 + ... + 6821.

Almost surely, 2^18265728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18265728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26132400).

18265728 is an abundant number, since it is smaller than the sum of its proper divisors (33999072).

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

18265728 is a wasteful number, since it uses less digits than its factorization.

18265728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3689 (or 3677 counting only the distinct ones).

The product of its digits is 53760, while the sum is 39.

The square root of 18265728 is about 4273.8422993835. The cubic root of 18265728 is about 263.3574825189.

The spelling of 18265728 in words is "eighteen million, two hundred sixty-five thousand, seven hundred twenty-eight".