91791974400 has 504 divisors, whose sum is σ = 353174884200. Its totient is φ = 20974141440.

The previous prime is 91791974387. The next prime is 91791974447. The reversal of 91791974400 is 447919719.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 30104076 + ... + 30107124.

Almost surely, 2^91791974400 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 91791974400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176587442100).

91791974400 is an abundant number, since it is smaller than the sum of its proper divisors (261382909800).

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

91791974400 is a wasteful number, since it uses less digits than its factorization.

91791974400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3102 (or 3066 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 51.

The spelling of 91791974400 in words is "ninety-one billion, seven hundred ninety-one million, nine hundred seventy-four thousand, four hundred".