31708311312 has 80 divisors (see below), whose sum is σ = 84687579648. Its totient is φ = 10212510720.

The previous prime is 31708311289. The next prime is 31708311469. The reversal of 31708311312 is 21311380713.

It is a super-2 number, since 2×31708311312² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31708311312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 955348 + ... + 987980.

Almost surely, 2^31708311312 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 31708311312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42343789824).

31708311312 is an abundant number, since it is smaller than the sum of its proper divisors (52979268336).

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

31708311312 is a wasteful number, since it uses less digits than its factorization.

31708311312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33328 (or 33322 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The spelling of 31708311312 in words is "thirty-one billion, seven hundred eight million, three hundred eleven thousand, three hundred twelve".