91688318 has 8 divisors (see below), whose sum is σ = 137725920. Its totient is φ = 45779680.

The previous prime is 91688309. The next prime is 91688323. The reversal of 91688318 is 81388619.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30443 + ... + 33318.

It is an arithmetic number, because the mean of its divisors is an integer number (17215740).

Almost surely, 2^91688318 is an apocalyptic number.

91688318 is a deficient number, since it is larger than the sum of its proper divisors (46037602).

91688318 is a wasteful number, since it uses less digits than its factorization.

91688318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64482.

The product of its digits is 82944, while the sum is 44.

The square root of 91688318 is about 9575.4017148107. The cubic root of 91688318 is about 450.9253682206.

The spelling of 91688318 in words is "ninety-one million, six hundred eighty-eight thousand, three hundred eighteen".