31307500664 has 64 divisors (see below), whose sum is σ = 64693404000. Its totient is φ = 14085406720.

The previous prime is 31307500661. The next prime is 31307500691. The reversal of 31307500664 is 46600570313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31307500661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9236282 + ... + 9239670.

Almost surely, 2^31307500664 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 31307500664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32346702000).

31307500664 is an abundant number, since it is smaller than the sum of its proper divisors (33385903336).

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

31307500664 is a wasteful number, since it uses less digits than its factorization.

31307500664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4448 (or 4444 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 35.

The spelling of 31307500664 in words is "thirty-one billion, three hundred seven million, five hundred thousand, six hundred sixty-four".