91098240 has 128 divisors (see below), whose sum is σ = 307566720. Its totient is φ = 22855680.

The previous prime is 91098211. The next prime is 91098277. The reversal of 91098240 is 4289019.

It is a tau number, because it is divible by the number of its divisors (128).

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, 31245 + ... + 34035.

It is an arithmetic number, because the mean of its divisors is an integer number (2402865).

Almost surely, 2^91098240 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 91098240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153783360).

91098240 is an abundant number, since it is smaller than the sum of its proper divisors (216468480).

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

91098240 is a wasteful number, since it uses less digits than its factorization.

91098240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830 (or 2818 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 91098240 is about 9544.5398003256. The cubic root of 91098240 is about 449.9559463047.

The spelling of 91098240 in words is "ninety-one million, ninety-eight thousand, two hundred forty".