681742 has 8 divisors (see below), whose sum is σ = 1037232. Its totient is φ = 336000.

The previous prime is 681731. The next prime is 681763. The reversal of 681742 is 247186.

681742 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 681742.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2259 + ... + 2542.

It is an arithmetic number, because the mean of its divisors is an integer number (129654).

2⁶⁸¹⁷⁴² is an apocalyptic number.

681742 is a deficient number, since it is larger than the sum of its proper divisors (355490).

681742 is a wasteful number, since it uses less digits than its factorization.

681742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4874.

The product of its digits is 2688, while the sum is 28.

The square root of 681742 is about 825.6766921744. The cubic root of 681742 is about 88.0116203663.

It can be divided in two parts, 6817 and 42, that added together give a cube (6859 = 19³).

The spelling of 681742 in words is "six hundred eighty-one thousand, seven hundred forty-two".