91791067840 has 112 divisors (see below), whose sum is σ = 221763396960. Its totient is φ = 36183490560.

The previous prime is 91791067817. The next prime is 91791067861. The reversal of 91791067840 is 4876019719.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11177656 + ... + 11185864.

It is an arithmetic number, because the mean of its divisors is an integer number (1980030330).

Almost surely, 2^91791067840 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 91791067840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110881698480).

91791067840 is an abundant number, since it is smaller than the sum of its proper divisors (129972329120).

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

91791067840 is a wasteful number, since it uses less digits than its factorization.

91791067840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8730 (or 8720 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 52.

The spelling of 91791067840 in words is "ninety-one billion, seven hundred ninety-one million, sixty-seven thousand, eight hundred forty".