6729 has 4 divisors (see below), whose sum is σ = 8976. Its totient is φ = 4484.

The previous prime is 6719. The next prime is 6733. The reversal of 6729 is 9276.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6729 - 2⁸ = 6473 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 6699 and 6708.

It is not an unprimeable number, because it can be changed into a prime (6709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1119 + ... + 1124.

It is an arithmetic number, because the mean of its divisors is an integer number (2244).

2⁶⁷²⁹ is an apocalyptic number.

It is an amenable number.

6729 is a deficient number, since it is larger than the sum of its proper divisors (2247).

6729 is a wasteful number, since it uses less digits than its factorization.

6729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246.

The product of its digits is 756, while the sum is 24.

The square root of 6729 is about 82.0304821393. The cubic root of 6729 is about 18.8791966167.

The spelling of 6729 in words is "six thousand, seven hundred twenty-nine".