91909016320 has 72 divisors (see below), whose sum is σ = 240164562960. Its totient is φ = 33421455360.

The previous prime is 91909016317. The next prime is 91909016371. The reversal of 91909016320 is 2361090919.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3249735 + ... + 3277894.

It is an arithmetic number, because the mean of its divisors is an integer number (3335618930).

Almost surely, 2^91909016320 is an apocalyptic number.

It is an amenable number.

91909016320 is an abundant number, since it is smaller than the sum of its proper divisors (148255546640).

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

91909016320 is a wasteful number, since it uses less digits than its factorization.

91909016320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6527661 (or 6527647 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 40.

The spelling of 91909016320 in words is "ninety-one billion, nine hundred nine million, sixteen thousand, three hundred twenty".