91000068 has 12 divisors (see below), whose sum is σ = 212333520. Its totient is φ = 30333352.

The previous prime is 91000051. The next prime is 91000081. The reversal of 91000068 is 86000019.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3791658 + ... + 3791681.

It is an arithmetic number, because the mean of its divisors is an integer number (17694460).

Almost surely, 2^91000068 is an apocalyptic number.

It is an amenable number.

91000068 is an abundant number, since it is smaller than the sum of its proper divisors (121333452).

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

91000068 is a wasteful number, since it uses less digits than its factorization.

91000068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7583346 (or 7583344 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 91000068 is about 9539.3955783372. The cubic root of 91000068 is about 449.7942565642.

The spelling of 91000068 in words is "ninety-one million, sixty-eight", and thus it is an aban number and an uban number.