91751707782 has 96 divisors (see below), whose sum is σ = 233726717952. Its totient is φ = 25463460672.

The previous prime is 91751707753. The next prime is 91751707799. The reversal of 91751707782 is 28770715719.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2813623 + ... + 2846045.

It is an arithmetic number, because the mean of its divisors is an integer number (2434653312).

Almost surely, 2^91751707782 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91751707782, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116863358976).

91751707782 is an abundant number, since it is smaller than the sum of its proper divisors (141975010170).

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

91751707782 is a wasteful number, since it uses less digits than its factorization.

91751707782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33082 (or 33079 counting only the distinct ones).

The product of its (nonzero) digits is 1728720, while the sum is 54.

The spelling of 91751707782 in words is "ninety-one billion, seven hundred fifty-one million, seven hundred seven thousand, seven hundred eighty-two".