684928 has 16 divisors (see below), whose sum is σ = 1364760. Its totient is φ = 342400.

The previous prime is 684923. The next prime is 684949. The reversal of 684928 is 829486.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2548 + ... + 2803.

2⁶⁸⁴⁹²⁸ is an apocalyptic number.

It is an amenable number.

684928 is a deficient number, since it is larger than the sum of its proper divisors (679832).

684928 is an equidigital number, since it uses as much as digits as its factorization.

684928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5365 (or 5353 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 684928 is about 827.6037699286. The cubic root of 684928 is about 88.1485095636.

The spelling of 684928 in words is "six hundred eighty-four thousand, nine hundred twenty-eight".