680985 has 24 divisors (see below), whose sum is σ = 1215240. Its totient is φ = 352512.

The previous prime is 680971. The next prime is 680987. The reversal of 680985 is 589086.

It can be written as a sum of positive squares in 4 ways, for example, as 345744 + 335241 = 588^2 + 579^2 .

It is not a de Polignac number, because 680985 - 2⁷ = 680857 is a prime.

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 680985.

It is not an unprimeable number, because it can be changed into a prime (680987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1461 + ... + 1869.

It is an arithmetic number, because the mean of its divisors is an integer number (50635).

2⁶⁸⁰⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

680985 is a deficient number, since it is larger than the sum of its proper divisors (534255).

680985 is a wasteful number, since it uses less digits than its factorization.

680985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457 (or 454 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 680985 is about 825.2181529753. The cubic root of 680985 is about 87.9790325390.

The spelling of 680985 in words is "six hundred eighty thousand, nine hundred eighty-five".