16320728 has 16 divisors (see below), whose sum is σ = 30721680. Its totient is φ = 8128288.

The previous prime is 16320727. The next prime is 16320739. The reversal of 16320728 is 82702361.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 16320728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16320721) 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, 1775 + ... + 5982.

It is an arithmetic number, because the mean of its divisors is an integer number (1920105).

Almost surely, 2^16320728 is an apocalyptic number.

It is an amenable number.

16320728 is a deficient number, since it is larger than the sum of its proper divisors (14400952).

16320728 is a wasteful number, since it uses less digits than its factorization.

16320728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8026 (or 8022 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 16320728 is about 4039.8920777664. The cubic root of 16320728 is about 253.6567997975.

The spelling of 16320728 in words is "sixteen million, three hundred twenty thousand, seven hundred twenty-eight".