684224 has 14 divisors (see below), whose sum is σ = 1357884. Its totient is φ = 342080.

The previous prime is 684221. The next prime is 684239. The reversal of 684224 is 422486.

It is a junction number, because it is equal to n+sod(n) for n = 684193 and 684202.

It is not an unprimeable number, because it can be changed into a prime (684221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5282 + ... + 5409.

2⁶⁸⁴²²⁴ is an apocalyptic number.

684224 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

684224 is a deficient number, since it is larger than the sum of its proper divisors (673660).

684224 is a wasteful number, since it uses less digits than its factorization.

684224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10703 (or 10693 counting only the distinct ones).

The product of its digits is 3072, while the sum is 26.

The square root of 684224 is about 827.1783362734. The cubic root of 684224 is about 88.1182982010.

The spelling of 684224 in words is "six hundred eighty-four thousand, two hundred twenty-four".