91318688 has 12 divisors (see below), whose sum is σ = 179783730. Its totient is φ = 45659328.

The previous prime is 91318687. The next prime is 91318739. The reversal of 91318688 is 88681319.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 56130064 + 35188624 = 7492^2 + 5932^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (91318681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1426823 + ... + 1426886.

Almost surely, 2^91318688 is an apocalyptic number.

It is an amenable number.

91318688 is a deficient number, since it is larger than the sum of its proper divisors (88465042).

91318688 is a wasteful number, since it uses less digits than its factorization.

91318688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2853719 (or 2853711 counting only the distinct ones).

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

The square root of 91318688 is about 9556.0812051803. The cubic root of 91318688 is about 450.3186023582.

The spelling of 91318688 in words is "ninety-one million, three hundred eighteen thousand, six hundred eighty-eight".