91688896 has 56 divisors (see below), whose sum is σ = 197301104. Its totient is φ = 42024960.

The previous prime is 91688893. The next prime is 91688899. The reversal of 91688896 is 69888619.

It is an interprime number because it is at equal distance from previous prime (91688893) and next prime (91688899).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91688893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160291 + ... + 160861.

It is an arithmetic number, because the mean of its divisors is an integer number (3523234).

Almost surely, 2^91688896 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 91688896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98650552).

91688896 is an abundant number, since it is smaller than the sum of its proper divisors (105612208).

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

91688896 is a wasteful number, since it uses less digits than its factorization.

91688896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789 (or 779 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 55.

The square root of 91688896 is about 9575.4318962645. The cubic root of 91688896 is about 450.9263157580.

The spelling of 91688896 in words is "ninety-one million, six hundred eighty-eight thousand, eight hundred ninety-six".