320728404216 has 64 divisors (see below), whose sum is σ = 882738806400. Its totient is φ = 96298761600.

The previous prime is 320728404211. The next prime is 320728404229. The reversal of 320728404216 is 612404827023.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320728404211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5544070 + ... + 5601621.

It is an arithmetic number, because the mean of its divisors is an integer number (13792793850).

Almost surely, 2^320728404216 is an apocalyptic number.

It is an amenable number.

320728404216 is an abundant number, since it is smaller than the sum of its proper divisors (562010402184).

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

320728404216 is a wasteful number, since it uses less digits than its factorization.

320728404216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11145820 (or 11145816 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 39.

The spelling of 320728404216 in words is "three hundred twenty billion, seven hundred twenty-eight million, four hundred four thousand, two hundred sixteen".