680866 has 8 divisors (see below), whose sum is σ = 1025820. Its totient is φ = 338928.

The previous prime is 680861. The next prime is 680873. The reversal of 680866 is 668086.

It is a happy number.

680866 is nontrivially palindromic in base 8.

It can be written as a sum of positive squares in 2 ways, for example, as 664225 + 16641 = 815^2 + 129^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (680861) 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, 61 + ... + 1168.

2⁶⁸⁰⁸⁶⁶ is an apocalyptic number.

680866 is a deficient number, since it is larger than the sum of its proper divisors (344954).

680866 is a wasteful number, since it uses less digits than its factorization.

680866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1508.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 680866 is about 825.1460476788. The cubic root of 680866 is about 87.9739075535.

The spelling of 680866 in words is "six hundred eighty thousand, eight hundred sixty-six".