6728394556789 has 8 divisors (see below), whose sum is σ = 6819543083448. Its totient is φ = 6637727025600.

The previous prime is 6728394556783. The next prime is 6728394556799. The reversal of 6728394556789 is 9876554938276.

It can be written as a sum of positive squares in 4 ways, for example, as 2193411354289 + 4534983202500 = 1481017^2 + 2129550^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6728394556789 - 2¹⁵ = 6728394524021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6728394556783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120220702 + ... + 120276655.

It is an arithmetic number, because the mean of its divisors is an integer number (852442885431).

Almost surely, 2^{6728394556789} is an apocalyptic number.

It is an amenable number.

6728394556789 is a deficient number, since it is larger than the sum of its proper divisors (91148526659).

6728394556789 is a wasteful number, since it uses less digits than its factorization.

6728394556789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240497735.

The product of its digits is 5486745600, while the sum is 79.

The spelling of 6728394556789 in words is "six trillion, seven hundred twenty-eight billion, three hundred ninety-four million, five hundred fifty-six thousand, seven hundred eighty-nine".