91989800 has 48 divisors (see below), whose sum is σ = 244433760. Its totient is φ = 31538880.

The previous prime is 91989767. The next prime is 91989841. The reversal of 91989800 is 898919.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31454 + ... + 34253.

It is an arithmetic number, because the mean of its divisors is an integer number (5092370).

Almost surely, 2^91989800 is an apocalyptic number.

It is an amenable number.

91989800 is an abundant number, since it is smaller than the sum of its proper divisors (152443960).

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

91989800 is a wasteful number, since it uses less digits than its factorization.

91989800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65730 (or 65721 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 91989800 is about 9591.1313201311. The cubic root of 91989800 is about 451.4190594359.

The spelling of 91989800 in words is "ninety-one million, nine hundred eighty-nine thousand, eight hundred".