647564643732 has 48 divisors (see below), whose sum is σ = 1524902081472. Its totient is φ = 213867978240.

The previous prime is 647564643689. The next prime is 647564643751. The reversal of 647564643732 is 237346465746.

It is a happy number.

647564643732 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3762807 + ... + 3931137.

It is an arithmetic number, because the mean of its divisors is an integer number (31768793364).

Almost surely, 2^647564643732 is an apocalyptic number.

It is an amenable number.

647564643732 is an abundant number, since it is smaller than the sum of its proper divisors (877337437740).

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

647564643732 is a wasteful number, since it uses less digits than its factorization.

647564643732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171288 (or 171286 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 57.

The spelling of 647564643732 in words is "six hundred forty-seven billion, five hundred sixty-four million, six hundred forty-three thousand, seven hundred thirty-two".