91686008440 has 48 divisors (see below), whose sum is σ = 223382939400. Its totient is φ = 33853292928.

The previous prime is 91686008431. The next prime is 91686008443. The reversal of 91686008440 is 4480068619.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91686008443) 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, 6774750 + ... + 6788269.

Almost surely, 2^91686008440 is an apocalyptic number.

It is an amenable number.

91686008440 is an abundant number, since it is smaller than the sum of its proper divisors (131696930960).

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

91686008440 is a wasteful number, since it uses less digits than its factorization.

91686008440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13563056 (or 13563039 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 46.

The spelling of 91686008440 in words is "ninety-one billion, six hundred eighty-six million, eight thousand, four hundred forty".