91686608 has 40 divisors (see below), whose sum is σ = 194940648. Its totient is φ = 41513472.

The previous prime is 91686601. The next prime is 91686611. The reversal of 91686608 is 80668619.

It can be written as a sum of positive squares in 4 ways, for example, as 32581264 + 59105344 = 5708^2 + 7688^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91686601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6866 + ... + 15182.

Almost surely, 2^91686608 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 91686608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97470324).

91686608 is an abundant number, since it is smaller than the sum of its proper divisors (103254040).

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

91686608 is a wasteful number, since it uses less digits than its factorization.

91686608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8391 (or 8385 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 91686608 is about 9575.3124231014. The cubic root of 91686608 is about 450.9225649294.

The spelling of 91686608 in words is "ninety-one million, six hundred eighty-six thousand, six hundred eight".