91117668 has 12 divisors (see below), whose sum is σ = 212607920. Its totient is φ = 30372552.

The previous prime is 91117667. The next prime is 91117687. The reversal of 91117668 is 86671119.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (91117667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3796558 + ... + 3796581.

Almost surely, 2^91117668 is an apocalyptic number.

It is an amenable number.

91117668 is an abundant number, since it is smaller than the sum of its proper divisors (121490252).

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

91117668 is a wasteful number, since it uses less digits than its factorization.

91117668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7593146 (or 7593144 counting only the distinct ones).

The product of its digits is 18144, while the sum is 39.

The square root of 91117668 is about 9545.5575007435. The cubic root of 91117668 is about 449.9879305405.

The spelling of 91117668 in words is "ninety-one million, one hundred seventeen thousand, six hundred sixty-eight".