6680729 has 4 divisors (see below), whose sum is σ = 7288080. Its totient is φ = 6073380.

The previous prime is 6680699. The next prime is 6680731. The reversal of 6680729 is 9270866.

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 a de Polignac number, because none of the positive numbers 2^k-6680729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6680692 and 6680701.

It is not an unprimeable number, because it can be changed into a prime (6680789) 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, 303659 + ... + 303680.

It is an arithmetic number, because the mean of its divisors is an integer number (1822020).

Almost surely, 2^6680729 is an apocalyptic number.

It is an amenable number.

6680729 is a deficient number, since it is larger than the sum of its proper divisors (607351).

6680729 is a wasteful number, since it uses less digits than its factorization.

6680729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607350.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 6680729 is about 2584.7106221007. The cubic root of 6680729 is about 188.3394444637.

The spelling of 6680729 in words is "six million, six hundred eighty thousand, seven hundred twenty-nine".