681285 has 16 divisors (see below), whose sum is σ = 1189440. Its totient is φ = 330240.

The previous prime is 681271. The next prime is 681293. The reversal of 681285 is 582186.

It is not a de Polignac number, because 681285 - 2⁵ = 681253 is a prime.

681285 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1900 + ... + 2229.

It is an arithmetic number, because the mean of its divisors is an integer number (74340).

2⁶⁸¹²⁸⁵ is an apocalyptic number.

It is an amenable number.

681285 is a deficient number, since it is larger than the sum of its proper divisors (508155).

681285 is a wasteful number, since it uses less digits than its factorization.

681285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4148.

The product of its digits is 3840, while the sum is 30.

The square root of 681285 is about 825.3999030773. The cubic root of 681285 is about 87.9919500212.

Subtracting from 681285 its reverse (582186), we obtain a palindrome (99099).

The spelling of 681285 in words is "six hundred eighty-one thousand, two hundred eighty-five".