91880136 has 64 divisors (see below), whose sum is σ = 258763200. Its totient is φ = 30201984.

The previous prime is 91880093. The next prime is 91880141. The reversal of 91880136 is 63108819.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 91880136.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12855 + ... + 18681.

It is an arithmetic number, because the mean of its divisors is an integer number (4043175).

Almost surely, 2^91880136 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 91880136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129381600).

91880136 is an abundant number, since it is smaller than the sum of its proper divisors (166883064).

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

91880136 is a wasteful number, since it uses less digits than its factorization.

91880136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5915 (or 5905 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 91880136 is about 9585.4126671730. The cubic root of 91880136 is about 451.2396043778.

The spelling of 91880136 in words is "ninety-one million, eight hundred eighty thousand, one hundred thirty-six".