31308568064 has 80 divisors (see below), whose sum is σ = 63815558400. Its totient is φ = 15340775424.

The previous prime is 31308568043. The next prime is 31308568069. The reversal of 31308568064 is 46086580313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31308568069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10843229 + ... + 10846115.

It is an arithmetic number, because the mean of its divisors is an integer number (797694480).

Almost surely, 2^31308568064 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 31308568064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31907779200).

31308568064 is an abundant number, since it is smaller than the sum of its proper divisors (32506990336).

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

31308568064 is an equidigital number, since it uses as much as digits as its factorization.

31308568064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3323 (or 3307 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 31308568064 in words is "thirty-one billion, three hundred eight million, five hundred sixty-eight thousand, sixty-four".