31047987312 has 80 divisors (see below), whose sum is σ = 89212583680. Its totient is φ = 10338487488.

The previous prime is 31047987253. The next prime is 31047987319. The reversal of 31047987312 is 21378974013.

It is a super-2 number, since 2×31047987312² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31047987319) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 380583 + ... + 454905.

It is an arithmetic number, because the mean of its divisors is an integer number (1115157296).

Almost surely, 2^31047987312 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 31047987312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44606291840).

31047987312 is an abundant number, since it is smaller than the sum of its proper divisors (58164596368).

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

31047987312 is a wasteful number, since it uses less digits than its factorization.

31047987312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75307 (or 75295 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The spelling of 31047987312 in words is "thirty-one billion, forty-seven million, nine hundred eighty-seven thousand, three hundred twelve".