91795578776 has 64 divisors (see below), whose sum is σ = 198941184000. Its totient is φ = 39244648960.

The previous prime is 91795578773. The next prime is 91795578799. The reversal of 91795578776 is 67787559719.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91795578773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2312585 + ... + 2351943.

It is an arithmetic number, because the mean of its divisors is an integer number (3108456000).

Almost surely, 2^91795578776 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 91795578776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99470592000).

91795578776 is an abundant number, since it is smaller than the sum of its proper divisors (107145605224).

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

91795578776 is a wasteful number, since it uses less digits than its factorization.

91795578776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40952 (or 40948 counting only the distinct ones).

The product of its digits is 233377200, while the sum is 71.

The spelling of 91795578776 in words is "ninety-one billion, seven hundred ninety-five million, five hundred seventy-eight thousand, seven hundred seventy-six".