18116728 has 32 divisors (see below), whose sum is σ = 40867200. Its totient is φ = 7355232.

The previous prime is 18116723. The next prime is 18116729. The reversal of 18116728 is 82761181.

It is a junction number, because it is equal to n+sod(n) for n = 18116693 and 18116702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18116723) 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, 7450 + ... + 9577.

It is an arithmetic number, because the mean of its divisors is an integer number (1277100).

Almost surely, 2^18116728 is an apocalyptic number.

It is an amenable number.

18116728 is an abundant number, since it is smaller than the sum of its proper divisors (22750472).

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

18116728 is a wasteful number, since it uses less digits than its factorization.

18116728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17059 (or 17055 counting only the distinct ones).

The product of its digits is 5376, while the sum is 34.

The square root of 18116728 is about 4256.3749834807. The cubic root of 18116728 is about 262.6394264598.

The spelling of 18116728 in words is "eighteen million, one hundred sixteen thousand, seven hundred twenty-eight".