320340531140 has 108 divisors (see below), whose sum is σ = 818050517676. Its totient is φ = 105055606656.

The previous prime is 320340531139. The next prime is 320340531197. The reversal of 320340531140 is 41135043023.

It can be written as a sum of positive squares in 2 ways, for example, as 252648980164 + 67691550976 = 502642^2 + 260176^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 209462 + ... + 827378.

Almost surely, 2^320340531140 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 320340531140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (409025258838).

320340531140 is an abundant number, since it is smaller than the sum of its proper divisors (497709986536).

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

320340531140 is a wasteful number, since it uses less digits than its factorization.

320340531140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617986 (or 617954 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 320340531140 its reverse (41135043023), we get a palindrome (361475574163).

The spelling of 320340531140 in words is "three hundred twenty billion, three hundred forty million, five hundred thirty-one thousand, one hundred forty".