320644406240 has 96 divisors (see below), whose sum is σ = 760602648960. Its totient is φ = 127736953344.

The previous prime is 320644406231. The next prime is 320644406267. The reversal of 320644406240 is 42604446023.

It is a self number, because there is not a number n which added to its sum of digits gives 320644406240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98385731 + ... + 98388989.

It is an arithmetic number, because the mean of its divisors is an integer number (7922944260).

Almost surely, 2^320644406240 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 320644406240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (380301324480).

320644406240 is an abundant number, since it is smaller than the sum of its proper divisors (439958242720).

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

320644406240 is a wasteful number, since it uses less digits than its factorization.

320644406240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5584 (or 5576 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 35.

The spelling of 320644406240 in words is "three hundred twenty billion, six hundred forty-four million, four hundred six thousand, two hundred forty".