320813081872 has 20 divisors (see below), whose sum is σ = 648600361920. Its totient is φ = 153432343328.

The previous prime is 320813081861. The next prime is 320813081879. The reversal of 320813081872 is 278180318023.

It is not an unprimeable number, because it can be changed into a prime (320813081879) 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 3 ways as a sum of consecutive naturals, for example, 435886972 + ... + 435887707.

It is an arithmetic number, because the mean of its divisors is an integer number (32430018096).

Almost surely, 2^320813081872 is an apocalyptic number.

It is an amenable number.

320813081872 is an abundant number, since it is smaller than the sum of its proper divisors (327787280048).

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

320813081872 is a wasteful number, since it uses less digits than its factorization.

320813081872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871774710 (or 871774704 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 43.

Adding to 320813081872 its reverse (278180318023), we get a palindrome (598993399895).

The spelling of 320813081872 in words is "three hundred twenty billion, eight hundred thirteen million, eighty-one thousand, eight hundred seventy-two".