91726237680 has 1280 divisors, whose sum is σ = 401528586240. Its totient is φ = 16860856320.

The previous prime is 91726237679. The next prime is 91726237703. The reversal of 91726237680 is 8673262719.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 722253777 + ... + 722253903.

It is an arithmetic number, because the mean of its divisors is an integer number (313694208).

Almost surely, 2^91726237680 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 91726237680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200764293120).

91726237680 is an abundant number, since it is smaller than the sum of its proper divisors (309802348560).

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

91726237680 is a wasteful number, since it uses less digits than its factorization.

91726237680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 51.

The spelling of 91726237680 in words is "ninety-one billion, seven hundred twenty-six million, two hundred thirty-seven thousand, six hundred eighty".