31964864646 has 96 divisors (see below), whose sum is σ = 77609193984. Its totient is φ = 8652571200.

The previous prime is 31964864627. The next prime is 31964864713. The reversal of 31964864646 is 64646846913.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 805155 + ... + 843921.

It is an arithmetic number, because the mean of its divisors is an integer number (808429104).

Almost surely, 2^31964864646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31964864646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38804596992).

31964864646 is an abundant number, since it is smaller than the sum of its proper divisors (45644329338).

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

31964864646 is a wasteful number, since it uses less digits than its factorization.

31964864646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38858 (or 38827 counting only the distinct ones).

The product of its digits is 17915904, while the sum is 57.

The spelling of 31964864646 in words is "thirty-one billion, nine hundred sixty-four million, eight hundred sixty-four thousand, six hundred forty-six".