6728129856 has 84 divisors (see below), whose sum is σ = 22039978272. Its totient is φ = 1922321664.

The previous prime is 6728129819. The next prime is 6728129861. The reversal of 6728129856 is 6589218276.

It is a tau number, because it is divible by the number of its divisors (84).

It is a congruent number.

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, 830310 + ... + 838373.

Almost surely, 2^6728129856 is an apocalyptic number.

It is an amenable number.

6728129856 is an abundant number, since it is smaller than the sum of its proper divisors (15311848416).

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

6728129856 is a wasteful number, since it uses less digits than its factorization.

6728129856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668708 (or 1668695 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 6728129856 is about 82025.1781832871. The cubic root of 6728129856 is about 1887.8382809389.

It can be divided in two parts, 672 and 8129856, that added together give a triangular number (8130528 = T₄₀₃₂).

The spelling of 6728129856 in words is "six billion, seven hundred twenty-eight million, one hundred twenty-nine thousand, eight hundred fifty-six".