681885 has 16 divisors (see below), whose sum is σ = 1212480. Its totient is φ = 363600.

The previous prime is 681883. The next prime is 681899. The reversal of 681885 is 588186.

It is not a de Polignac number, because 681885 - 2¹ = 681883 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681883) 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, 2391 + ... + 2660.

It is an arithmetic number, because the mean of its divisors is an integer number (75780).

2⁶⁸¹⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

681885 is a deficient number, since it is larger than the sum of its proper divisors (530595).

681885 is a wasteful number, since it uses less digits than its factorization.

681885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5065 (or 5059 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 681885 is about 825.7632832719. The cubic root of 681885 is about 88.0177736138.

It can be divided in two parts, 6818 and 85, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 681885 in words is "six hundred eighty-one thousand, eight hundred eighty-five".