685530 has 32 divisors (see below), whose sum is σ = 1828800. Its totient is φ = 182736.

The previous prime is 685519. The next prime is 685537. The reversal of 685530 is 35586.

685530 is nontrivially palindromic in base 4.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 685494 and 685503.

It is not an unprimeable number, because it can be changed into a prime (685537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1000 + ... + 1539.

It is an arithmetic number, because the mean of its divisors is an integer number (57150).

2⁶⁸⁵⁵³⁰ is an apocalyptic number.

685530 is an abundant number, since it is smaller than the sum of its proper divisors (1143270).

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

685530 is a wasteful number, since it uses less digits than its factorization.

685530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2555 (or 2549 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 685530 is about 827.9673906622. The cubic root of 685530 is about 88.1743272960.

The spelling of 685530 in words is "six hundred eighty-five thousand, five hundred thirty".