680709 has 4 divisors (see below), whose sum is σ = 907616. Its totient is φ = 453804.

The previous prime is 680707. The next prime is 680749. The reversal of 680709 is 907086.

It is a happy number.

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 not a de Polignac number, because 680709 - 2¹ = 680707 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 680709.

It is not an unprimeable number, because it can be changed into a prime (680707) 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, 113449 + ... + 113454.

It is an arithmetic number, because the mean of its divisors is an integer number (226904).

2⁶⁸⁰⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

680709 is a deficient number, since it is larger than the sum of its proper divisors (226907).

680709 is a wasteful number, since it uses less digits than its factorization.

680709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226906.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 680709 is about 825.0509075203. The cubic root of 680709 is about 87.9671451043.

The spelling of 680709 in words is "six hundred eighty thousand, seven hundred nine".