681746 has 12 divisors (see below), whose sum is σ = 1107882. Its totient is φ = 314496.

The previous prime is 681731. The next prime is 681763. The reversal of 681746 is 647186.

It can be written as a sum of positive squares in 3 ways, for example, as 469225 + 212521 = 685^2 + 461^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 671 + ... + 1346.

2⁶⁸¹⁷⁴⁶ is an apocalyptic number.

681746 is a deficient number, since it is larger than the sum of its proper divisors (426136).

681746 is a wasteful number, since it uses less digits than its factorization.

681746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045 (or 2032 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 681746 is about 825.6791144264. The cubic root of 681746 is about 88.0117924968.

The spelling of 681746 in words is "six hundred eighty-one thousand, seven hundred forty-six".