647373681252 has 36 divisors (see below), whose sum is σ = 1692844973820. Its totient is φ = 208350149952.

The previous prime is 647373681211. The next prime is 647373681271. The reversal of 647373681252 is 252186373746.

It is a happy number.

647373681252 is a `hidden beast` number, since 6 + 473 + 73 + 6 + 81 + 25 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 347446586916 + 299927094336 = 589446^2 + 547656^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 310043823 + ... + 310045910.

It is an arithmetic number, because the mean of its divisors is an integer number (47023471495).

Almost surely, 2^647373681252 is an apocalyptic number.

It is an amenable number.

647373681252 is an abundant number, since it is smaller than the sum of its proper divisors (1045471292568).

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

647373681252 is a wasteful number, since it uses less digits than its factorization.

647373681252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620089772 (or 620089767 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 54.

The spelling of 647373681252 in words is "six hundred forty-seven billion, three hundred seventy-three million, six hundred eighty-one thousand, two hundred fifty-two".