647810685832 has 16 divisors (see below), whose sum is σ = 1231284010140. Its totient is φ = 319468283136.

The previous prime is 647810685811. The next prime is 647810685833. The reversal of 647810685832 is 238586018746.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 584726326276 + 63084359556 = 764674^2 + 251166^2 .

It is not an unprimeable number, because it can be changed into a prime (647810685833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 554631853 + ... + 554633020.

Almost surely, 2^647810685832 is an apocalyptic number.

It is an amenable number.

647810685832 is a deficient number, since it is larger than the sum of its proper divisors (583473324308).

647810685832 is a wasteful number, since it uses less digits than its factorization.

647810685832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109264952 (or 1109264948 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 58.

The spelling of 647810685832 in words is "six hundred forty-seven billion, eight hundred ten million, six hundred eighty-five thousand, eight hundred thirty-two".