681712 has 20 divisors (see below), whose sum is σ = 1334736. Its totient is φ = 337280.

The previous prime is 681689. The next prime is 681719. The reversal of 681712 is 217186.

681712 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2037 + ... + 2347.

2⁶⁸¹⁷¹² is an apocalyptic number.

It is an amenable number.

681712 is a deficient number, since it is larger than the sum of its proper divisors (653024).

681712 is a wasteful number, since it uses less digits than its factorization.

681712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456 (or 450 counting only the distinct ones).

The product of its digits is 672, while the sum is 25.

The square root of 681712 is about 825.6585250574. The cubic root of 681712 is about 88.0103293660.

Adding to 681712 its reverse (217186), we get a palindrome (898898).

It can be divided in two parts, 6 and 81712, that added together give a palindrome (81718).

The spelling of 681712 in words is "six hundred eighty-one thousand, seven hundred twelve".