320388539406 has 24 divisors (see below), whose sum is σ = 693859205880. Its totient is φ = 98581088736.

The previous prime is 320388539347. The next prime is 320388539413. The reversal of 320388539406 is 604935883023.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157981501 + ... + 157983528.

It is an arithmetic number, because the mean of its divisors is an integer number (28910800245).

Almost surely, 2^320388539406 is an apocalyptic number.

320388539406 is an abundant number, since it is smaller than the sum of its proper divisors (373470666474).

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

320388539406 is a wasteful number, since it uses less digits than its factorization.

320388539406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315965060 (or 315965047 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 51.

The spelling of 320388539406 in words is "three hundred twenty billion, three hundred eighty-eight million, five hundred thirty-nine thousand, four hundred six".