91840880 has 40 divisors (see below), whose sum is σ = 215946000. Its totient is φ = 36320768.

The previous prime is 91840871. The next prime is 91840907. The reversal of 91840880 is 8804819.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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, 671 + ... + 13569.

It is an arithmetic number, because the mean of its divisors is an integer number (5398650).

Almost surely, 2^91840880 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91840880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107973000).

91840880 is an abundant number, since it is smaller than the sum of its proper divisors (124105120).

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

91840880 is a wasteful number, since it uses less digits than its factorization.

91840880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13001 (or 12995 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 91840880 is about 9583.3647535717. The cubic root of 91840880 is about 451.1753308361.

The spelling of 91840880 in words is "ninety-one million, eight hundred forty thousand, eight hundred eighty".