91816688 has 10 divisors (see below), whose sum is σ = 177894864. Its totient is φ = 45908336.

The previous prime is 91816687. The next prime is 91816729. The reversal of 91816688 is 88661819.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91816687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2869256 + ... + 2869287.

Almost surely, 2^91816688 is an apocalyptic number.

It is an amenable number.

91816688 is a deficient number, since it is larger than the sum of its proper divisors (86078176).

91816688 is a wasteful number, since it uses less digits than its factorization.

91816688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5738551 (or 5738545 counting only the distinct ones).

The product of its digits is 165888, while the sum is 47.

The square root of 91816688 is about 9582.1024832758. The cubic root of 91816688 is about 451.1357123419.

The spelling of 91816688 in words is "ninety-one million, eight hundred sixteen thousand, six hundred eighty-eight".