91099880 has 32 divisors (see below), whose sum is σ = 205459200. Its totient is φ = 36353856.

The previous prime is 91099873. The next prime is 91099891. The reversal of 91099880 is 8899019.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16061 + ... + 20979.

It is an arithmetic number, because the mean of its divisors is an integer number (6420600).

Almost surely, 2^91099880 is an apocalyptic number.

It is an amenable number.

91099880 is an abundant number, since it is smaller than the sum of its proper divisors (114359320).

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

91099880 is a wasteful number, since it uses less digits than its factorization.

91099880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5393 (or 5389 counting only the distinct ones).

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

The square root of 91099880 is about 9544.6257129340. The cubic root of 91099880 is about 449.9586464056.

The spelling of 91099880 in words is "ninety-one million, ninety-nine thousand, eight hundred eighty".