31968657472 has 28 divisors (see below), whose sum is σ = 64477776556. Its totient is φ = 15722288640.

The previous prime is 31968657463. The next prime is 31968657503. The reversal of 31968657472 is 27475686913.

It can be written as a sum of positive squares in 2 ways, for example, as 17070990336 + 14897667136 = 130656^2 + 122056^2 .

It is a super-2 number, since 2×31968657472² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4090443 + ... + 4098250.

Almost surely, 2^31968657472 is an apocalyptic number.

31968657472 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31968657472 is an abundant number, since it is smaller than the sum of its proper divisors (32509119084).

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

31968657472 is an equidigital number, since it uses as much as digits as its factorization.

31968657472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8188766 (or 8188756 counting only the distinct ones).

The product of its digits is 15240960, while the sum is 58.

It can be divided in two parts, 3196 and 8657472, that added together give a palindrome (8660668).

The spelling of 31968657472 in words is "thirty-one billion, nine hundred sixty-eight million, six hundred fifty-seven thousand, four hundred seventy-two".