6671729 has 4 divisors (see below), whose sum is σ = 6852084. Its totient is φ = 6491376.

The previous prime is 6671723. The next prime is 6671747. The reversal of 6671729 is 9271766.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2958400 + 3713329 = 1720^2 + 1927^2 .

It is a cyclic number.

It is not a de Polignac number, because 6671729 - 2⁴ = 6671713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6671692 and 6671701.

It is not an unprimeable number, because it can be changed into a prime (6671723) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 90122 + ... + 90195.

It is an arithmetic number, because the mean of its divisors is an integer number (1713021).

Almost surely, 2^6671729 is an apocalyptic number.

It is an amenable number.

6671729 is a deficient number, since it is larger than the sum of its proper divisors (180355).

6671729 is a wasteful number, since it uses less digits than its factorization.

6671729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180354.

The product of its digits is 31752, while the sum is 38.

The square root of 6671729 is about 2582.9690280760. The cubic root of 6671729 is about 188.2548321038.

The spelling of 6671729 in words is "six million, six hundred seventy-one thousand, seven hundred twenty-nine".