91108836 has 216 divisors, whose sum is σ = 300638520. Its totient is φ = 23030784.

The previous prime is 91108817. The next prime is 91108841. The reversal of 91108836 is 63880119.

It can be written as a sum of positive squares in 4 ways, for example, as 5731236 + 85377600 = 2394^2 + 9240^2 .

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 91108836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 664960 + ... + 665096.

It is an arithmetic number, because the mean of its divisors is an integer number (1391845).

Almost surely, 2^91108836 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 91108836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150319260).

91108836 is an abundant number, since it is smaller than the sum of its proper divisors (209529684).

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

91108836 is a wasteful number, since it uses less digits than its factorization.

91108836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 191 counting only the distinct ones).

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

The square root of 91108836 is about 9545.0948659508. The cubic root of 91108836 is about 449.9733910192.

The spelling of 91108836 in words is "ninety-one million, one hundred eight thousand, eight hundred thirty-six".