684613 has 4 divisors (see below), whose sum is σ = 686880. Its totient is φ = 682348.

The previous prime is 684599. The next prime is 684617. The reversal of 684613 is 316486.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 316486 = 2 ⋅158243.

It is a cyclic number.

It is not a de Polignac number, because 684613 - 2⁵ = 684581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684617) 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, 595 + ... + 1312.

It is an arithmetic number, because the mean of its divisors is an integer number (171720).

2⁶⁸⁴⁶¹³ is an apocalyptic number.

It is an amenable number.

684613 is a deficient number, since it is larger than the sum of its proper divisors (2267).

684613 is a wasteful number, since it uses less digits than its factorization.

684613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2266.

The product of its digits is 3456, while the sum is 28.

The square root of 684613 is about 827.4134395814. The cubic root of 684613 is about 88.1349942557.

It can be divided in two parts, 6846 and 13, that added together give a cube (6859 = 19³).

The spelling of 684613 in words is "six hundred eighty-four thousand, six hundred thirteen".