685056 has 44 divisors (see below), whose sum is σ = 1834112. Its totient is φ = 227328.

The previous prime is 685051. The next prime is 685057. The reversal of 685056 is 650586.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685051) by changing a digit.

685056 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 3 ways as a sum of consecutive naturals, for example, 2961 + ... + 3183.

2⁶⁸⁵⁰⁵⁶ 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 685056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (917056).

685056 is an abundant number, since it is smaller than the sum of its proper divisors (1149056).

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

685056 is a wasteful number, since it uses less digits than its factorization.

685056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 685056 is about 827.6810980082. The cubic root of 685056 is about 88.1540003141.

The spelling of 685056 in words is "six hundred eighty-five thousand, fifty-six".