680865 has 16 divisors (see below), whose sum is σ = 1147200. Its totient is φ = 343872.

The previous prime is 680861. The next prime is 680873. The reversal of 680865 is 568086.

680865 = T₂₆₆ + T₂₆₇ + ... + T₂₈₃.

It is not a de Polignac number, because 680865 - 2² = 680861 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 680865.

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 15 ways as a sum of consecutive naturals, for example, 910 + ... + 1479.

It is an arithmetic number, because the mean of its divisors is an integer number (71700).

2⁶⁸⁰⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

680865 is a deficient number, since it is larger than the sum of its proper divisors (466335).

680865 is a wasteful number, since it uses less digits than its factorization.

680865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2416.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 680865 is about 825.1454417253. The cubic root of 680865 is about 87.9738644838.

The spelling of 680865 in words is "six hundred eighty thousand, eight hundred sixty-five".