91083580 has 72 divisors (see below), whose sum is σ = 226213344. Its totient is φ = 30176640.

The previous prime is 91083571. The next prime is 91083581. The reversal of 91083580 is 8538019.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91083581) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 134202 + ... + 134878.

It is an arithmetic number, because the mean of its divisors is an integer number (3141852).

Almost surely, 2^91083580 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 91083580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113106672).

91083580 is an abundant number, since it is smaller than the sum of its proper divisors (135129764).

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

91083580 is a wasteful number, since it uses less digits than its factorization.

91083580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755 (or 722 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 91083580 is about 9543.7717910688. The cubic root of 91083580 is about 449.9318085971.

The spelling of 91083580 in words is "ninety-one million, eighty-three thousand, five hundred eighty".