91808766 has 96 divisors (see below), whose sum is σ = 239016960. Its totient is φ = 24919488.

The previous prime is 91808737. The next prime is 91808777. The reversal of 91808766 is 66780819.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 218905 + ... + 219323.

It is an arithmetic number, because the mean of its divisors is an integer number (2489760).

Almost surely, 2^91808766 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91808766, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119508480).

91808766 is an abundant number, since it is smaller than the sum of its proper divisors (147208194).

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

91808766 is a wasteful number, since it uses less digits than its factorization.

91808766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 91808766 is about 9581.6890995273. The cubic root of 91808766 is about 451.1227372137.

The spelling of 91808766 in words is "ninety-one million, eight hundred eight thousand, seven hundred sixty-six".