18270728 has 48 divisors (see below), whose sum is σ = 40273920. Its totient is φ = 7747488.

The previous prime is 18270727. The next prime is 18270737. The reversal of 18270728 is 82707281.

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

It is not an unprimeable number, because it can be changed into a prime (18270727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49601 + ... + 49967.

It is an arithmetic number, because the mean of its divisors is an integer number (839040).

Almost surely, 2^18270728 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 18270728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20136960).

18270728 is an abundant number, since it is smaller than the sum of its proper divisors (22003192).

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

18270728 is a wasteful number, since it uses less digits than its factorization.

18270728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514 (or 503 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 18270728 is about 4274.4272130895. The cubic root of 18270728 is about 263.3815105288.

The spelling of 18270728 in words is "eighteen million, two hundred seventy thousand, seven hundred twenty-eight".