31261984768 has 96 divisors (see below), whose sum is σ = 71541550080. Its totient is φ = 13378682880.

The previous prime is 31261984763. The next prime is 31261984771. The reversal of 31261984768 is 86748916213.

It is not an unprimeable number, because it can be changed into a prime (31261984763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14808033 + ... + 14810143.

It is an arithmetic number, because the mean of its divisors is an integer number (745224480).

Almost surely, 2^31261984768 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 31261984768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35770775040).

31261984768 is an abundant number, since it is smaller than the sum of its proper divisors (40279565312).

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

31261984768 is a wasteful number, since it uses less digits than its factorization.

31261984768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3173 (or 3153 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 55.

The spelling of 31261984768 in words is "thirty-one billion, two hundred sixty-one million, nine hundred eighty-four thousand, seven hundred sixty-eight".