91939960320 has 640 divisors, whose sum is σ = 352912412160. Its totient is φ = 20171980800.

The previous prime is 91939960319. The next prime is 91939960373. The reversal of 91939960320 is 2306993919.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 32246895 + ... + 32249745.

It is an arithmetic number, because the mean of its divisors is an integer number (551425644).

Almost surely, 2^91939960320 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 91939960320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176456206080).

91939960320 is an abundant number, since it is smaller than the sum of its proper divisors (260972451840).

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

91939960320 is a wasteful number, since it uses less digits than its factorization.

91939960320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2926 (or 2910 counting only the distinct ones).

The product of its (nonzero) digits is 708588, while the sum is 51.

The spelling of 91939960320 in words is "ninety-one billion, nine hundred thirty-nine million, nine hundred sixty thousand, three hundred twenty".