680965 has 4 divisors (see below), whose sum is σ = 817164. Its totient is φ = 544768.

The previous prime is 680959. The next prime is 680971. The reversal of 680965 is 569086.

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

It is an interprime number because it is at equal distance from previous prime (680959) and next prime (680971).

It can be written as a sum of positive squares in 2 ways, for example, as 116964 + 564001 = 342^2 + 751^2 .

It is a cyclic number.

It is not a de Polignac number, because 680965 - 2⁹ = 680453 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 680965.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68092 + ... + 68101.

It is an arithmetic number, because the mean of its divisors is an integer number (204291).

2⁶⁸⁰⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

680965 is a deficient number, since it is larger than the sum of its proper divisors (136199).

680965 is a wasteful number, since it uses less digits than its factorization.

680965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136198.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 680965 is about 825.2060348786. The cubic root of 680965 is about 87.9781712386.

The spelling of 680965 in words is "six hundred eighty thousand, nine hundred sixty-five".