6728439 has 4 divisors (see below), whose sum is σ = 8971256. Its totient is φ = 4485624.

The previous prime is 6728437. The next prime is 6728441. The reversal of 6728439 is 9348276.

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

It is an interprime number because it is at equal distance from previous prime (6728437) and next prime (6728441).

It is not a de Polignac number, because 6728439 - 2¹ = 6728437 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6728397 and 6728406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6728437) 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, 1121404 + ... + 1121409.

It is an arithmetic number, because the mean of its divisors is an integer number (2242814).

Almost surely, 2^6728439 is an apocalyptic number.

6728439 is a deficient number, since it is larger than the sum of its proper divisors (2242817).

6728439 is a wasteful number, since it uses less digits than its factorization.

6728439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2242816.

The product of its digits is 72576, while the sum is 39.

The square root of 6728439 is about 2593.9234761265. The cubic root of 6728439 is about 188.7867194617.

It can be divided in two parts, 6728 and 439, that multiplied together give a palindrome (2953592).

The spelling of 6728439 in words is "six million, seven hundred twenty-eight thousand, four hundred thirty-nine".