31999999968 has 120 divisors (see below), whose sum is σ = 96654944232. Its totient is φ = 10378347264.

The previous prime is 31999999957. The next prime is 31999999973. The reversal of 31999999968 is 86999999913.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 70930 + ... + 262737.

Almost surely, 2^31999999968 is an apocalyptic number.

It is an amenable number.

31999999968 is an abundant number, since it is smaller than the sum of its proper divisors (64654944264).

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

31999999968 is a wasteful number, since it uses less digits than its factorization.

31999999968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333726 (or 333709 counting only the distinct ones).

The product of its digits is 688747536, while the sum is 81.

Subtracting 31999999968 from its reverse (86999999913), we obtain a palindrome (54999999945).

It can be divided in two parts, 31 and 999999968, that added together give a palindrome (999999999).

The spelling of 31999999968 in words is "thirty-one billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred sixty-eight".