91791400888320 has 576 divisors, whose sum is σ = 342538252842240. Its totient is φ = 20923597062144.

The previous prime is 91791400888301. The next prime is 91791400888349. The reversal of 91791400888320 is 2388800419719.

It is a super-2 number, since 2×91791400888320² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 552354682 + ... + 552520838.

It is an arithmetic number, because the mean of its divisors is an integer number (594684466740).

Almost surely, 2^{91791400888320} 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 91791400888320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171269126421120).

91791400888320 is an abundant number, since it is smaller than the sum of its proper divisors (250746851953920).

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

91791400888320 is a wasteful number, since it uses less digits than its factorization.

91791400888320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166568 (or 166541 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 60.

The spelling of 91791400888320 in words is "ninety-one trillion, seven hundred ninety-one billion, four hundred million, eight hundred eighty-eight thousand, three hundred twenty".