6728165 has 4 divisors (see below), whose sum is σ = 8073804. Its totient is φ = 5382528.

The previous prime is 6728149. The next prime is 6728171. The reversal of 6728165 is 5618276.

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 2122849 + 4605316 = 1457^2 + 2146^2 .

It is a cyclic number.

It is not a de Polignac number, because 6728165 - 2⁴ = 6728149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 672812 + ... + 672821.

It is an arithmetic number, because the mean of its divisors is an integer number (2018451).

Almost surely, 2^6728165 is an apocalyptic number.

It is an amenable number.

6728165 is a deficient number, since it is larger than the sum of its proper divisors (1345639).

6728165 is a wasteful number, since it uses less digits than its factorization.

6728165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345638.

The product of its digits is 20160, while the sum is 35.

The square root of 6728165 is about 2593.8706598441. The cubic root of 6728165 is about 188.7841567938.

The spelling of 6728165 in words is "six million, seven hundred twenty-eight thousand, one hundred sixty-five".