680885 has 4 divisors (see below), whose sum is σ = 817068. Its totient is φ = 544704.

The previous prime is 680881. The next prime is 680917. The reversal of 680885 is 588086.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 588086 = 2 ⋅294043.

It can be written as a sum of positive squares in 2 ways, for example, as 538756 + 142129 = 734^2 + 377^2 .

It is a cyclic number.

It is not a de Polignac number, because 680885 - 2² = 680881 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

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 680885.

It is not an unprimeable number, because it can be changed into a prime (680881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68084 + ... + 68093.

It is an arithmetic number, because the mean of its divisors is an integer number (204267).

2⁶⁸⁰⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

680885 is a deficient number, since it is larger than the sum of its proper divisors (136183).

680885 is a wasteful number, since it uses less digits than its factorization.

680885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136182.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 680885 is about 825.1575607119. The cubic root of 680885 is about 87.9747258685.

The spelling of 680885 in words is "six hundred eighty thousand, eight hundred eighty-five".