320531339520 has 432 divisors, whose sum is σ = 1268708837760. Its totient is φ = 73190670336.

The previous prime is 320531339507. The next prime is 320531339603. The reversal of 320531339520 is 25933135023.

It is a happy number.

320531339520 is a `hidden beast` number, since 3 + 2 + 0 + 531 + 33 + 95 + 2 + 0 = 666.

It is a super-2 number, since 2×320531339520² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 150553816 + ... + 150555944.

Almost surely, 2^320531339520 is an apocalyptic number.

320531339520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320531339520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (634354418880).

320531339520 is an abundant number, since it is smaller than the sum of its proper divisors (948177498240).

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

320531339520 is a wasteful number, since it uses less digits than its factorization.

320531339520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4030 (or 4013 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 36.

The spelling of 320531339520 in words is "three hundred twenty billion, five hundred thirty-one million, three hundred thirty-nine thousand, five hundred twenty".