6728039069 has 4 divisors (see below), whose sum is σ = 6729534396. Its totient is φ = 6726543744.

The previous prime is 6728039057. The next prime is 6728039077. The reversal of 6728039069 is 9609308276.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 108264025 + 6619775044 = 10405^2 + 81362^2 .

It is a cyclic number.

It is not a de Polignac number, because 6728039069 - 2²⁰ = 6726990493 is a prime.

It is a super-2 number, since 2×6728039069² = 90533019427980773522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6728009069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 740894 + ... + 749919.

It is an arithmetic number, because the mean of its divisors is an integer number (1682383599).

Almost surely, 2^6728039069 is an apocalyptic number.

It is an amenable number.

6728039069 is a deficient number, since it is larger than the sum of its proper divisors (1495327).

6728039069 is a wasteful number, since it uses less digits than its factorization.

6728039069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495326.

The product of its (nonzero) digits is 979776, while the sum is 50.

The square root of 6728039069 is about 82024.6247720768. The cubic root of 6728039069 is about 1887.8297896271.

The spelling of 6728039069 in words is "six billion, seven hundred twenty-eight million, thirty-nine thousand, sixty-nine".