91103621728 has 24 divisors (see below), whose sum is σ = 204983149392. Its totient is φ = 39044409216.

The previous prime is 91103621699. The next prime is 91103621731. The reversal of 91103621728 is 82712630119.

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, 203356075 + ... + 203356522.

It is an arithmetic number, because the mean of its divisors is an integer number (8540964558).

Almost surely, 2^91103621728 is an apocalyptic number.

It is an amenable number.

91103621728 is an abundant number, since it is smaller than the sum of its proper divisors (113879527664).

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

91103621728 is a wasteful number, since it uses less digits than its factorization.

91103621728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406712614 (or 406712606 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The spelling of 91103621728 in words is "ninety-one billion, one hundred three million, six hundred twenty-one thousand, seven hundred twenty-eight".