684626 has 8 divisors (see below), whose sum is σ = 1037820. Its totient is φ = 338688.

The previous prime is 684617. The next prime is 684637. The reversal of 684626 is 626486.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 638401 + 46225 = 799^2 + 215^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 684592 and 684601.

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, 1571 + ... + 1958.

2⁶⁸⁴⁶²⁶ is an apocalyptic number.

684626 is a deficient number, since it is larger than the sum of its proper divisors (353194).

684626 is a wasteful number, since it uses less digits than its factorization.

684626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3628.

The product of its digits is 13824, while the sum is 32.

The square root of 684626 is about 827.4212953508. The cubic root of 684626 is about 88.1355521124.

The spelling of 684626 in words is "six hundred eighty-four thousand, six hundred twenty-six".