91041930720 has 384 divisors, whose sum is σ = 346511692800. Its totient is φ = 22191335424.

The previous prime is 91041930647. The next prime is 91041930761. The reversal of 91041930720 is 2703914019.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 5776611 + ... + 5792349.

It is an arithmetic number, because the mean of its divisors is an integer number (902374200).

Almost surely, 2^91041930720 is an apocalyptic number.

91041930720 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91041930720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173255846400).

91041930720 is an abundant number, since it is smaller than the sum of its proper divisors (255469762080).

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

91041930720 is a wasteful number, since it uses less digits than its factorization.

91041930720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15879 (or 15865 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The spelling of 91041930720 in words is "ninety-one billion, forty-one million, nine hundred thirty thousand, seven hundred twenty".