320731652540 has 48 divisors (see below), whose sum is σ = 748745276160. Its totient is φ = 114603863040.

The previous prime is 320731652539. The next prime is 320731652621. The reversal of 320731652540 is 45256137023.

It is a junction number, because it is equal to n+sod(n) for n = 320731652494 and 320731652503.

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, 19888445 + ... + 19904564.

It is an arithmetic number, because the mean of its divisors is an integer number (15598859920).

Almost surely, 2^320731652540 is an apocalyptic number.

It is an amenable number.

320731652540 is an abundant number, since it is smaller than the sum of its proper divisors (428013623620).

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

320731652540 is a wasteful number, since it uses less digits than its factorization.

320731652540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39793062 (or 39793060 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 38.

Adding to 320731652540 its reverse (45256137023), we get a palindrome (365987789563).

The spelling of 320731652540 in words is "three hundred twenty billion, seven hundred thirty-one million, six hundred fifty-two thousand, five hundred forty".