91989835776 has 192 divisors, whose sum is σ = 279747943800. Its totient is φ = 29047652352.

The previous prime is 91989835727. The next prime is 91989835783. The reversal of 91989835776 is 67753898919.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5595120 + ... + 5611536.

Almost surely, 2^91989835776 is an apocalyptic number.

91989835776 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91989835776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139873971900).

91989835776 is an abundant number, since it is smaller than the sum of its proper divisors (187758108024).

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

91989835776 is a wasteful number, since it uses less digits than its factorization.

91989835776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16472 (or 16441 counting only the distinct ones).

The product of its digits is 205752960, while the sum is 72.

The spelling of 91989835776 in words is "ninety-one billion, nine hundred eighty-nine million, eight hundred thirty-five thousand, seven hundred seventy-six".