684556 has 12 divisors (see below), whose sum is σ = 1268568. Its totient is φ = 322112.

The previous prime is 684547. The next prime is 684557. The reversal of 684556 is 655486.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (684557) 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, 4966 + ... + 5101.

It is an arithmetic number, because the mean of its divisors is an integer number (105714).

2⁶⁸⁴⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

684556 is a deficient number, since it is larger than the sum of its proper divisors (584012).

684556 is a wasteful number, since it uses less digits than its factorization.

684556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10088 (or 10086 counting only the distinct ones).

The product of its digits is 28800, while the sum is 34.

The square root of 684556 is about 827.3789941738. The cubic root of 684556 is about 88.1325481857.

It can be divided in two parts, 68 and 4556, that added together give a square (4624 = 68²).

The spelling of 684556 in words is "six hundred eighty-four thousand, five hundred fifty-six".