91711270872 has 160 divisors (see below), whose sum is σ = 277263756000. Its totient is φ = 28154843136.

The previous prime is 91711270837. The next prime is 91711270891. The reversal of 91711270872 is 27807211719.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3770253 + ... + 3794499.

It is an arithmetic number, because the mean of its divisors is an integer number (1732898475).

Almost surely, 2^91711270872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91711270872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138631878000).

91711270872 is an abundant number, since it is smaller than the sum of its proper divisors (185552485128).

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

91711270872 is a wasteful number, since it uses less digits than its factorization.

91711270872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24727 (or 24714 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 45.

The spelling of 91711270872 in words is "ninety-one billion, seven hundred eleven million, two hundred seventy thousand, eight hundred seventy-two".