6728591 has 2 divisors, whose sum is σ = 6728592. Its totient is φ = 6728590.

The previous prime is 6728569. The next prime is 6728639. The reversal of 6728591 is 1958276.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6728591 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6728521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3364295 + 3364296.

It is an arithmetic number, because the mean of its divisors is an integer number (3364296).

Almost surely, 2^6728591 is an apocalyptic number.

6728591 is a deficient number, since it is larger than the sum of its proper divisors (1).

6728591 is an equidigital number, since it uses as much as digits as its factorization.

6728591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 38.

The square root of 6728591 is about 2593.9527752062. The cubic root of 6728591 is about 188.7881410577.

It can be divided in two parts, 67285 and 91, that added together give a palindrome (67376).

The spelling of 6728591 in words is "six million, seven hundred twenty-eight thousand, five hundred ninety-one".