6728345 has 16 divisors (see below), whose sum is σ = 9208080. Its totient is φ = 4675584.

The previous prime is 6728327. The next prime is 6728347. The reversal of 6728345 is 5438276.

It is a happy number.

6728345 is nontrivially palindromic in base 4.

It can be written as a sum of positive squares in 8 ways, for example, as 458329 + 6270016 = 677^2 + 2504^2 .

It is a cyclic number.

It is not a de Polignac number, because 6728345 - 2¹⁶ = 6662809 is a prime.

It is a Curzon number.

It is a zygodrome in base 7 and base 16.

It is not an unprimeable number, because it can be changed into a prime (6728347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1940 + ... + 4149.

It is an arithmetic number, because the mean of its divisors is an integer number (575505).

Almost surely, 2^6728345 is an apocalyptic number.

6728345 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6728345 is a deficient number, since it is larger than the sum of its proper divisors (2479735).

6728345 is a wasteful number, since it uses less digits than its factorization.

6728345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6124.

The product of its digits is 40320, while the sum is 35.

The square root of 6728345 is about 2593.9053567931. The cubic root of 6728345 is about 188.7858403061.

The spelling of 6728345 in words is "six million, seven hundred twenty-eight thousand, three hundred forty-five".