680717 has 4 divisors (see below), whose sum is σ = 704220. Its totient is φ = 657216.

The previous prime is 680707. The next prime is 680749. The reversal of 680717 is 717086.

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 561001 + 119716 = 749^2 + 346^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 23473 = 680717 / (6 + 8 + 0 + 7 + 1 + 7).

It is a Duffinian number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 680717.

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 680717.

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, 11708 + ... + 11765.

It is an arithmetic number, because the mean of its divisors is an integer number (176055).

2⁶⁸⁰⁷¹⁷ is an apocalyptic number.

It is an amenable number.

680717 is a deficient number, since it is larger than the sum of its proper divisors (23503).

680717 is a wasteful number, since it uses less digits than its factorization.

680717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23502.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 680717 is about 825.0557556917. The cubic root of 680717 is about 87.9674897128.

The spelling of 680717 in words is "six hundred eighty thousand, seven hundred seventeen".