91991903276 has 144 divisors (see below), whose sum is σ = 211925784000. Its totient is φ = 34015997952.

The previous prime is 91991903273. The next prime is 91991903347. The reversal of 91991903276 is 67230919919.

It is not an unprimeable number, because it can be changed into a prime (91991903273) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15671270 + ... + 15677138.

Almost surely, 2^91991903276 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 91991903276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105962892000).

91991903276 is an abundant number, since it is smaller than the sum of its proper divisors (119933880724).

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

91991903276 is a wasteful number, since it uses less digits than its factorization.

91991903276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6076 (or 6057 counting only the distinct ones).

The product of its (nonzero) digits is 1653372, while the sum is 56.

The spelling of 91991903276 in words is "ninety-one billion, nine hundred ninety-one million, nine hundred three thousand, two hundred seventy-six".