6728645 has 16 divisors (see below), whose sum is σ = 10067328. Its totient is φ = 4194240.

The previous prime is 6728639. The next prime is 6728653. The reversal of 6728645 is 5468276.

It is a happy number.

It is not a de Polignac number, because 6728645 - 2¹⁰ = 6727621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6728599 and 6728608.

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 15 ways as a sum of consecutive naturals, for example, 8354 + ... + 9123.

It is an arithmetic number, because the mean of its divisors is an integer number (629208).

Almost surely, 2^6728645 is an apocalyptic number.

It is an amenable number.

6728645 is a deficient number, since it is larger than the sum of its proper divisors (3338683).

6728645 is a wasteful number, since it uses less digits than its factorization.

6728645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17500.

The product of its digits is 80640, while the sum is 38.

The square root of 6728645 is about 2593.9631840101. The cubic root of 6728645 is about 188.7886460932.

The spelling of 6728645 in words is "six million, seven hundred twenty-eight thousand, six hundred forty-five".