91023796864 has 768 divisors, whose sum is σ = 270755654400. Its totient is φ = 29520691200.

The previous prime is 91023796861. The next prime is 91023796879. The reversal of 91023796864 is 46869732019.

It is not an unprimeable number, because it can be changed into a prime (91023796861) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 694838079 + ... + 694838209.

It is an arithmetic number, because the mean of its divisors is an integer number (352546425).

Almost surely, 2^91023796864 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 91023796864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135377827200).

91023796864 is an abundant number, since it is smaller than the sum of its proper divisors (179731857536).

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

91023796864 is a wasteful number, since it uses less digits than its factorization.

91023796864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 55.

The spelling of 91023796864 in words is "ninety-one billion, twenty-three million, seven hundred ninety-six thousand, eight hundred sixty-four".