681892 has 6 divisors (see below), whose sum is σ = 1193318. Its totient is φ = 340944.

The previous prime is 681883. The next prime is 681899. The reversal of 681892 is 298186.

681892 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 678976 + 2916 = 824^2 + 54^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681899) by changing a digit.

681892 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85233 + ... + 85240.

2⁶⁸¹⁸⁹² is an apocalyptic number.

It is an amenable number.

681892 is a deficient number, since it is larger than the sum of its proper divisors (511426).

681892 is a wasteful number, since it uses less digits than its factorization.

681892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170477 (or 170475 counting only the distinct ones).

The product of its digits is 6912, while the sum is 34.

The square root of 681892 is about 825.7675217638. The cubic root of 681892 is about 88.0180747997.

The spelling of 681892 in words is "six hundred eighty-one thousand, eight hundred ninety-two".