91079940 has 96 divisors (see below), whose sum is σ = 299384064. Its totient is φ = 20252160.

The previous prime is 91079909. The next prime is 91079959. The reversal of 91079940 is 4997019.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12610 + ... + 18470.

It is an arithmetic number, because the mean of its divisors is an integer number (3118584).

Almost surely, 2^91079940 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 91079940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149692032).

91079940 is an abundant number, since it is smaller than the sum of its proper divisors (208304124).

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

91079940 is a wasteful number, since it uses less digits than its factorization.

91079940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5917 (or 5915 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 91079940 is about 9543.5810888785. The cubic root of 91079940 is about 449.9258149313.

The spelling of 91079940 in words is "ninety-one million, seventy-nine thousand, nine hundred forty".