6728465978 has 16 divisors (see below), whose sum is σ = 10872708840. Its totient is φ = 3104403456.

The previous prime is 6728465941. The next prime is 6728465993. The reversal of 6728465978 is 8795648276.

It can be written as a sum of positive squares in 4 ways, for example, as 6728428729 + 37249 = 82027^2 + 193^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6728465978.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38426 + ... + 122202.

Almost surely, 2^6728465978 is an apocalyptic number.

6728465978 is a deficient number, since it is larger than the sum of its proper divisors (4144242862).

6728465978 is a wasteful number, since it uses less digits than its factorization.

6728465978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86881.

The product of its digits is 40642560, while the sum is 62.

The square root of 6728465978 is about 82027.2270529731. The cubic root of 6728465978 is about 1887.8697177783.

The spelling of 6728465978 in words is "six billion, seven hundred twenty-eight million, four hundred sixty-five thousand, nine hundred seventy-eight".