91787878400 has 168 divisors, whose sum is σ = 229477336320. Its totient is φ = 36415733760.

The previous prime is 91787878397. The next prime is 91787878421. The reversal of 91787878400 is 487878719.

It is a self number, because there is not a number n which added to its sum of digits gives 91787878400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26007836 + ... + 26011364.

Almost surely, 2^91787878400 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 91787878400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114738668160).

91787878400 is an abundant number, since it is smaller than the sum of its proper divisors (137689457920).

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

91787878400 is a wasteful number, since it uses less digits than its factorization.

91787878400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3692 (or 3663 counting only the distinct ones).

The product of its (nonzero) digits is 6322176, while the sum is 59.

The spelling of 91787878400 in words is "ninety-one billion, seven hundred eighty-seven million, eight hundred seventy-eight thousand, four hundred".