683645 has 8 divisors (see below), whose sum is σ = 832056. Its totient is φ = 539136.

The previous prime is 683603. The next prime is 683651. The reversal of 683645 is 546386.

It can be written as a sum of positive squares in 4 ways, for example, as 1369 + 682276 = 37^2 + 826^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 683645 - 2¹⁸ = 421501 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 572 + ... + 1301.

It is an arithmetic number, because the mean of its divisors is an integer number (104007).

2⁶⁸³⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

683645 is a deficient number, since it is larger than the sum of its proper divisors (148411).

683645 is a wasteful number, since it uses less digits than its factorization.

683645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1951.

The product of its digits is 17280, while the sum is 32.

The square root of 683645 is about 826.8282772136. The cubic root of 683645 is about 88.0934355377.

The spelling of 683645 in words is "six hundred eighty-three thousand, six hundred forty-five".