91873866 has 32 divisors (see below), whose sum is σ = 215123328. Its totient is φ = 25608960.

The previous prime is 91873853. The next prime is 91873867. The reversal of 91873866 is 66837819.

It is not an unprimeable number, because it can be changed into a prime (91873867) 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, 24955 + ... + 28398.

It is an arithmetic number, because the mean of its divisors is an integer number (6722604).

Almost surely, 2^91873866 is an apocalyptic number.

91873866 is an abundant number, since it is smaller than the sum of its proper divisors (123249462).

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

91873866 is a wasteful number, since it uses less digits than its factorization.

91873866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53406.

The product of its digits is 435456, while the sum is 48.

The square root of 91873866 is about 9585.0856021217. The cubic root of 91873866 is about 451.2293397846.

The spelling of 91873866 in words is "ninety-one million, eight hundred seventy-three thousand, eight hundred sixty-six".