91668136 has 16 divisors (see below), whose sum is σ = 196431840. Its totient is φ = 39286320.

The previous prime is 91668113. The next prime is 91668151. The reversal of 91668136 is 63186619.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 818410 + ... + 818521.

It is an arithmetic number, because the mean of its divisors is an integer number (12276990).

Almost surely, 2^91668136 is an apocalyptic number.

It is an amenable number.

91668136 is an abundant number, since it is smaller than the sum of its proper divisors (104763704).

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

91668136 is a wasteful number, since it uses less digits than its factorization.

91668136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636944 (or 1636940 counting only the distinct ones).

The product of its digits is 46656, while the sum is 40.

The square root of 91668136 is about 9574.3478106866. The cubic root of 91668136 is about 450.8922806046.

The spelling of 91668136 in words is "ninety-one million, six hundred sixty-eight thousand, one hundred thirty-six".