685450 has 12 divisors (see below), whose sum is σ = 1275030. Its totient is φ = 274160.

The previous prime is 685429. The next prime is 685453. The reversal of 685450 is 54586.

685450 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 613089 + 72361 = 783^2 + 269^2 .

It is not an unprimeable number, because it can be changed into a prime (685453) by changing a digit.

685450 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 5 ways as a sum of consecutive naturals, for example, 6805 + ... + 6904.

2⁶⁸⁵⁴⁵⁰ is an apocalyptic number.

685450 is a deficient number, since it is larger than the sum of its proper divisors (589580).

685450 is a wasteful number, since it uses less digits than its factorization.

685450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13721 (or 13716 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 685450 is about 827.9190781713. The cubic root of 685450 is about 88.1708972392.

The spelling of 685450 in words is "six hundred eighty-five thousand, four hundred fifty".