91208664 has 96 divisors (see below), whose sum is σ = 264529200. Its totient is φ = 28304640.

The previous prime is 91208657. The next prime is 91208669. The reversal of 91208664 is 46680219.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91208669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82902 + ... + 83994.

Almost surely, 2^91208664 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 91208664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132264600).

91208664 is an abundant number, since it is smaller than the sum of its proper divisors (173320536).

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

91208664 is a wasteful number, since it uses less digits than its factorization.

91208664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185 (or 1178 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 91208664 is about 9550.3227170604. The cubic root of 91208664 is about 450.1376763925.

The spelling of 91208664 in words is "ninety-one million, two hundred eight thousand, six hundred sixty-four".