685512 has 24 divisors (see below), whose sum is σ = 1856790. Its totient is φ = 228480.

The previous prime is 685511. The next prime is 685513. The reversal of 685512 is 215586.

685512 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (685511) and next prime (685513).

It can be written as a sum of positive squares in only one way, i.e., 599076 + 86436 = 774^2 + 294^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (685511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4689 + ... + 4832.

2⁶⁸⁵⁵¹² is an apocalyptic number.

It is an amenable number.

685512 is an abundant number, since it is smaller than the sum of its proper divisors (1171278).

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

685512 is a wasteful number, since it uses less digits than its factorization.

685512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9533 (or 9526 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 685512 is about 827.9565205975. The cubic root of 685512 is about 88.1735555565.

The spelling of 685512 in words is "six hundred eighty-five thousand, five hundred twelve".