91804497152 has 72 divisors (see below), whose sum is σ = 189277670400. Its totient is φ = 44394301440.

The previous prime is 91804497149. The next prime is 91804497167. The reversal of 91804497152 is 25179440819.

It is a happy number.

It is a super-2 number, since 2×91804497152² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91804497152.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20178974 + ... + 20183522.

Almost surely, 2^91804497152 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 91804497152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94638835200).

91804497152 is an abundant number, since it is smaller than the sum of its proper divisors (97473173248).

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

91804497152 is a wasteful number, since it uses less digits than its factorization.

91804497152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7139 (or 7125 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 91804497152 in words is "ninety-one billion, eight hundred four million, four hundred ninety-seven thousand, one hundred fifty-two".