31520012304 has 160 divisors (see below), whose sum is σ = 96729523200. Its totient is φ = 8736698880.

The previous prime is 31520012299. The next prime is 31520012339. The reversal of 31520012304 is 40321002513.

It is a super-2 number, since 2×31520012304² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 236757 + ... + 345099.

It is an arithmetic number, because the mean of its divisors is an integer number (604559520).

Almost surely, 2^31520012304 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 31520012304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48364761600).

31520012304 is an abundant number, since it is smaller than the sum of its proper divisors (65209510896).

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

31520012304 is a wasteful number, since it uses less digits than its factorization.

31520012304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108413 (or 108407 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 31520012304 its reverse (40321002513), we get a palindrome (71841014817).

The spelling of 31520012304 in words is "thirty-one billion, five hundred twenty million, twelve thousand, three hundred four".