684682 has 4 divisors (see below), whose sum is σ = 1027026. Its totient is φ = 342340.

The previous prime is 684647. The next prime is 684683. The reversal of 684682 is 286486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 286486 = 2 ⋅143243.

It can be written as a sum of positive squares in only one way, i.e., 606841 + 77841 = 779^2 + 279^2 .

It is a super-2 number, since 2×684682² = 937578882248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (684683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171169 + ... + 171172.

2⁶⁸⁴⁶⁸² is an apocalyptic number.

684682 is a deficient number, since it is larger than the sum of its proper divisors (342344).

684682 is a wasteful number, since it uses less digits than its factorization.

684682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342343.

The product of its digits is 18432, while the sum is 34.

The square root of 684682 is about 827.4551347354. The cubic root of 684682 is about 88.1379551063.

The spelling of 684682 in words is "six hundred eighty-four thousand, six hundred eighty-two".