684522 has 24 divisors (see below), whose sum is σ = 1571076. Its totient is φ = 214656.

The previous prime is 684493. The next prime is 684527. The reversal of 684522 is 225486.

It can be written as a sum of positive squares in 2 ways, for example, as 622521 + 62001 = 789^2 + 249^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (684527) by changing a digit.

684522 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 813 + ... + 1424.

2⁶⁸⁴⁵²² is an apocalyptic number.

684522 is an abundant number, since it is smaller than the sum of its proper divisors (886554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

684522 is a wasteful number, since it uses less digits than its factorization.

684522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2262 (or 2259 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 684522 is about 827.3584471074. The cubic root of 684522 is about 88.1310890617.

The spelling of 684522 in words is "six hundred eighty-four thousand, five hundred twenty-two".