18242728 has 32 divisors (see below), whose sum is σ = 39312000. Its totient is φ = 7774272.

The previous prime is 18242713. The next prime is 18242737. The reversal of 18242728 is 82724281.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 18242693 and 18242702.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 10326 + ... + 11962.

It is an arithmetic number, because the mean of its divisors is an integer number (1228500).

Almost surely, 2^18242728 is an apocalyptic number.

It is an amenable number.

18242728 is an abundant number, since it is smaller than the sum of its proper divisors (21069272).

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

18242728 is a wasteful number, since it uses less digits than its factorization.

18242728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849 (or 1845 counting only the distinct ones).

The product of its digits is 14336, while the sum is 34.

The square root of 18242728 is about 4271.1506646336. The cubic root of 18242728 is about 263.2468971597.

The spelling of 18242728 in words is "eighteen million, two hundred forty-two thousand, seven hundred twenty-eight".