91664856 has 48 divisors (see below), whose sum is σ = 249007200. Its totient is φ = 30462912.

The previous prime is 91664851. The next prime is 91664857. The reversal of 91664856 is 65846619.

91664856 is a `hidden beast` number, since 9 + 166 + 485 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91664851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24690 + ... + 28158.

It is an arithmetic number, because the mean of its divisors is an integer number (5187650).

Almost surely, 2^91664856 is an apocalyptic number.

It is an amenable number.

91664856 is an abundant number, since it is smaller than the sum of its proper divisors (157342344).

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

91664856 is a wasteful number, since it uses less digits than its factorization.

91664856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3848 (or 3841 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 91664856 is about 9574.1765181137. The cubic root of 91664856 is about 450.8869027114.

The spelling of 91664856 in words is "ninety-one million, six hundred sixty-four thousand, eight hundred fifty-six".