18650728 has 16 divisors (see below), whose sum is σ = 35714880. Its totient is φ = 9126768.

The previous prime is 18650719. The next prime is 18650729. The reversal of 18650728 is 82705681.

It is not an unprimeable number, because it can be changed into a prime (18650729) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 24426 + ... + 25177.

It is an arithmetic number, because the mean of its divisors is an integer number (2232180).

Almost surely, 2^18650728 is an apocalyptic number.

It is an amenable number.

18650728 is a deficient number, since it is larger than the sum of its proper divisors (17064152).

18650728 is a wasteful number, since it uses less digits than its factorization.

18650728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49656 (or 49652 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 18650728 is about 4318.6488627810. The cubic root of 18650728 is about 265.1949579957.

The spelling of 18650728 in words is "eighteen million, six hundred fifty thousand, seven hundred twenty-eight".