647834664 has 16 divisors (see below), whose sum is σ = 1619586720. Its totient is φ = 215944880.

The previous prime is 647834651. The next prime is 647834713. The reversal of 647834664 is 466438746.

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 3 ways as a sum of consecutive naturals, for example, 13496532 + ... + 13496579.

It is an arithmetic number, because the mean of its divisors is an integer number (101224170).

Almost surely, 2^647834664 is an apocalyptic number.

It is an amenable number.

647834664 is an abundant number, since it is smaller than the sum of its proper divisors (971752056).

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

647834664 is a wasteful number, since it uses less digits than its factorization.

647834664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26993120 (or 26993116 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 48.

The square root of 647834664 is about 25452.5964097968. The cubic root of 647834664 is about 865.2761384627.

The spelling of 647834664 in words is "six hundred forty-seven million, eight hundred thirty-four thousand, six hundred sixty-four".