647872756 has 6 divisors (see below), whose sum is σ = 1133777330. Its totient is φ = 323936376.

The previous prime is 647872733. The next prime is 647872777. The reversal of 647872756 is 657278746.

647872756 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 550653156 + 97219600 = 23466^2 + 9860^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80984091 + ... + 80984098.

Almost surely, 2^647872756 is an apocalyptic number.

It is an amenable number.

647872756 is a deficient number, since it is larger than the sum of its proper divisors (485904574).

647872756 is a wasteful number, since it uses less digits than its factorization.

647872756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161968193 (or 161968191 counting only the distinct ones).

The product of its digits is 3951360, while the sum is 52.

The square root of 647872756 is about 25453.3446918082. The cubic root of 647872756 is about 865.2930972407.

The spelling of 647872756 in words is "six hundred forty-seven million, eight hundred seventy-two thousand, seven hundred fifty-six".