6728725 has 12 divisors (see below), whose sum is σ = 8632260. Its totient is φ = 5196800.

The previous prime is 6728723. The next prime is 6728731. The reversal of 6728725 is 5278276.

6728725 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 62001 + 6666724 = 249^2 + 2582^2 .

It is not a de Polignac number, because 6728725 - 2¹ = 6728723 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6728723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3916 + ... + 5365.

It is an arithmetic number, because the mean of its divisors is an integer number (719355).

Almost surely, 2^6728725 is an apocalyptic number.

It is an amenable number.

6728725 is a deficient number, since it is larger than the sum of its proper divisors (1903535).

6728725 is a wasteful number, since it uses less digits than its factorization.

6728725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9320 (or 9315 counting only the distinct ones).

The product of its digits is 47040, while the sum is 37.

The square root of 6728725 is about 2593.9786043836. The cubic root of 6728725 is about 188.7893942890.

The spelling of 6728725 in words is "six million, seven hundred twenty-eight thousand, seven hundred twenty-five".