6728666 has 16 divisors (see below), whose sum is σ = 11725440. Its totient is φ = 2836080.

The previous prime is 6728663. The next prime is 6728713. The reversal of 6728666 is 6668276.

It is a super-2 number, since 2×6728666² = 90549892279112, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6728663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3086 + ... + 4793.

It is an arithmetic number, because the mean of its divisors is an integer number (732840).

Almost surely, 2^6728666 is an apocalyptic number.

6728666 is a deficient number, since it is larger than the sum of its proper divisors (4996774).

6728666 is a wasteful number, since it uses less digits than its factorization.

6728666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7949.

The product of its digits is 145152, while the sum is 41.

The square root of 6728666 is about 2593.9672318670. The cubic root of 6728666 is about 188.7888424951.

The spelling of 6728666 in words is "six million, seven hundred twenty-eight thousand, six hundred sixty-six".