91901868 has 48 divisors (see below), whose sum is σ = 219319296. Its totient is φ = 29943360.

The previous prime is 91901867. The next prime is 91901911. The reversal of 91901868 is 86810919.

It is not an unprimeable number, because it can be changed into a prime (91901867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162955 + ... + 163517.

It is an arithmetic number, because the mean of its divisors is an integer number (4569152).

Almost surely, 2^91901868 is an apocalyptic number.

It is an amenable number.

91901868 is an abundant number, since it is smaller than the sum of its proper divisors (127417428).

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

91901868 is a wasteful number, since it uses less digits than its factorization.

91901868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854 (or 852 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 91901868 is about 9586.5461976668. The cubic root of 91901868 is about 451.2751781390.

The spelling of 91901868 in words is "ninety-one million, nine hundred one thousand, eight hundred sixty-eight".