685328 has 40 divisors (see below), whose sum is σ = 1577280. Its totient is φ = 282240.

The previous prime is 685319. The next prime is 685337. The reversal of 685328 is 823586.

It is an interprime number because it is at equal distance from previous prime (685319) and next prime (685337).

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 685294 and 685303.

It is a congruent number.

It is an unprimeable number.

685328 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3143 + ... + 3353.

It is an arithmetic number, because the mean of its divisors is an integer number (39432).

2⁶⁸⁵³²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (788640).

685328 is an abundant number, since it is smaller than the sum of its proper divisors (891952).

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

685328 is a wasteful number, since it uses less digits than its factorization.

685328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 249 counting only the distinct ones).

The product of its digits is 11520, while the sum is 32.

The square root of 685328 is about 827.8453961942. The cubic root of 685328 is about 88.1656658886.

The spelling of 685328 in words is "six hundred eighty-five thousand, three hundred twenty-eight".