91108080 has 120 divisors (see below), whose sum is σ = 349700832. Its totient is φ = 20823552.

The previous prime is 91108063. The next prime is 91108091. The reversal of 91108080 is 8080119.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3999 + ... + 14078.

Almost surely, 2^91108080 is an apocalyptic number.

91108080 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91108080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174850416).

91108080 is an abundant number, since it is smaller than the sum of its proper divisors (258592752).

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

91108080 is a wasteful number, since it uses less digits than its factorization.

91108080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18103 (or 18094 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 91108080 is about 9545.0552643764. The cubic root of 91108080 is about 449.9721464241.

Adding to 91108080 its reverse (8080119), we get a palindrome (99188199).

The spelling of 91108080 in words is "ninety-one million, one hundred eight thousand, eighty".