91688866 has 8 divisors (see below), whose sum is σ = 137656044. Its totient is φ = 45803520.

The previous prime is 91688843. The next prime is 91688867. The reversal of 91688866 is 66888619.

It can be written as a sum of positive squares in 2 ways, for example, as 90916225 + 772641 = 9535^2 + 879^2 .

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

It is not an unprimeable number, because it can be changed into a prime (91688867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17575 + ... + 22186.

Almost surely, 2^91688866 is an apocalyptic number.

91688866 is a deficient number, since it is larger than the sum of its proper divisors (45967178).

91688866 is a wasteful number, since it uses less digits than its factorization.

91688866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40916.

The product of its digits is 995328, while the sum is 52.

The square root of 91688866 is about 9575.4303297554. The cubic root of 91688866 is about 450.9262665779.

The spelling of 91688866 in words is "ninety-one million, six hundred eighty-eight thousand, eight hundred sixty-six".