328490172728 has 8 divisors (see below), whose sum is σ = 615919073880. Its totient is φ = 164245086360.

The previous prime is 328490172707. The next prime is 328490172737. The reversal of 328490172728 is 827271094823.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 328490172728.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20530635788 + ... + 20530635803.

It is an arithmetic number, because the mean of its divisors is an integer number (76989884235).

Almost surely, 2^328490172728 is an apocalyptic number.

It is an amenable number.

328490172728 is a deficient number, since it is larger than the sum of its proper divisors (287428901152).

328490172728 is a wasteful number, since it uses less digits than its factorization.

328490172728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41061271597 (or 41061271593 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 53.

The spelling of 328490172728 in words is "three hundred twenty-eight billion, four hundred ninety million, one hundred seventy-two thousand, seven hundred twenty-eight".