320403311312 has 60 divisors (see below), whose sum is σ = 725875450596. Its totient is φ = 136604160000.

The previous prime is 320403311303. The next prime is 320403311317. The reversal of 320403311312 is 213113304023.

It can be written as a sum of positive squares in 2 ways, for example, as 217133632576 + 103269678736 = 465976^2 + 321356^2 .

It is a super-2 number, since 2×320403311312² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320403311317) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 907439 + ... + 1210062.

Almost surely, 2^320403311312 is an apocalyptic number.

It is an amenable number.

320403311312 is an abundant number, since it is smaller than the sum of its proper divisors (405472139284).

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

320403311312 is a wasteful number, since it uses less digits than its factorization.

320403311312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117716 (or 2117703 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 320403311312 its reverse (213113304023), we get a palindrome (533516615335).

The spelling of 320403311312 in words is "three hundred twenty billion, four hundred three million, three hundred eleven thousand, three hundred twelve".