91688916 has 48 divisors (see below), whose sum is σ = 238371840. Its totient is φ = 27191520.

The previous prime is 91688899. The next prime is 91688921. The reversal of 91688916 is 61988619.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

91688916 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1186 + ... + 13593.

It is an arithmetic number, because the mean of its divisors is an integer number (4966080).

Almost surely, 2^91688916 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 91688916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119185920).

91688916 is an abundant number, since it is smaller than the sum of its proper divisors (146682924).

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

91688916 is a wasteful number, since it uses less digits than its factorization.

91688916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14844 (or 14842 counting only the distinct ones).

The product of its digits is 186624, while the sum is 48.

The square root of 91688916 is about 9575.4329406038. The cubic root of 91688916 is about 450.9263485447.

The spelling of 91688916 in words is "ninety-one million, six hundred eighty-eight thousand, nine hundred sixteen".