681734 has 8 divisors (see below), whose sum is σ = 1082808. Its totient is φ = 320800.

The previous prime is 681731. The next prime is 681763. The reversal of 681734 is 437186.

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

It is a super-2 number, since 2×681734² = 929522493512, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 681697 and 681706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681731) 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, 9992 + ... + 10059.

It is an arithmetic number, because the mean of its divisors is an integer number (135351).

2⁶⁸¹⁷³⁴ is an apocalyptic number.

681734 is a deficient number, since it is larger than the sum of its proper divisors (401074).

681734 is a wasteful number, since it uses less digits than its factorization.

681734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20070.

The product of its digits is 4032, while the sum is 29.

The square root of 681734 is about 825.6718476489. The cubic root of 681734 is about 88.0112761033.

The spelling of 681734 in words is "six hundred eighty-one thousand, seven hundred thirty-four".