18160728 has 64 divisors (see below), whose sum is σ = 47628000. Its totient is φ = 5763072.

The previous prime is 18160697. The next prime is 18160729. The reversal of 18160728 is 82706181.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18160729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67378 + ... + 67646.

Almost surely, 2^18160728 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 18160728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23814000).

18160728 is an abundant number, since it is smaller than the sum of its proper divisors (29467272).

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

18160728 is a wasteful number, since it uses less digits than its factorization.

18160728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404 (or 400 counting only the distinct ones).

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

The square root of 18160728 is about 4261.5405665088. The cubic root of 18160728 is about 262.8518782139.

The spelling of 18160728 in words is "eighteen million, one hundred sixty thousand, seven hundred twenty-eight".