91728008512 has 28 divisors (see below), whose sum is σ = 208026020320. Its totient is φ = 39312003456.

The previous prime is 91728008479. The next prime is 91728008521. The reversal of 91728008512 is 21580082719.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (28).

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 in 3 ways as a sum of consecutive naturals, for example, 102374562 + ... + 102375457.

Almost surely, 2^91728008512 is an apocalyptic number.

It is an amenable number.

91728008512 is an abundant number, since it is smaller than the sum of its proper divisors (116298011808).

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

91728008512 is a wasteful number, since it uses less digits than its factorization.

91728008512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204750038 (or 204750028 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 43.

The spelling of 91728008512 in words is "ninety-one billion, seven hundred twenty-eight million, eight thousand, five hundred twelve".