91582220388 has 48 divisors (see below), whose sum is σ = 216755481600. Its totient is φ = 30089959200.

The previous prime is 91582220381. The next prime is 91582220399. The reversal of 91582220388 is 88302228519.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (91582220381) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4190313 + ... + 4212111.

It is an arithmetic number, because the mean of its divisors is an integer number (4515739200).

Almost surely, 2^91582220388 is an apocalyptic number.

It is an amenable number.

91582220388 is an abundant number, since it is smaller than the sum of its proper divisors (125173261212).

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

91582220388 is a wasteful number, since it uses less digits than its factorization.

91582220388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26808 (or 26806 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 48.

The spelling of 91582220388 in words is "ninety-one billion, five hundred eighty-two million, two hundred twenty thousand, three hundred eighty-eight".