91820304780 has 96 divisors (see below), whose sum is σ = 272045813760. Its totient is φ = 23075205120.

The previous prime is 91820304743. The next prime is 91820304809. The reversal of 91820304780 is 8740302819.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6892 + ... + 428588.

It is an arithmetic number, because the mean of its divisors is an integer number (2833810560).

Almost surely, 2^91820304780 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 91820304780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136022906880).

91820304780 is an abundant number, since it is smaller than the sum of its proper divisors (180225508980).

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

91820304780 is a wasteful number, since it uses less digits than its factorization.

91820304780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421919 (or 421917 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The spelling of 91820304780 in words is "ninety-one billion, eight hundred twenty million, three hundred four thousand, seven hundred eighty".