685545 has 16 divisors (see below), whose sum is σ = 1253760. Its totient is φ = 313344.

The previous prime is 685541. The next prime is 685547. The reversal of 685545 is 545586.

It is not a de Polignac number, because 685545 - 2² = 685541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (685541) 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, 3160 + ... + 3369.

It is an arithmetic number, because the mean of its divisors is an integer number (78360).

2⁶⁸⁵⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

685545 is a deficient number, since it is larger than the sum of its proper divisors (568215).

685545 is a wasteful number, since it uses less digits than its factorization.

685545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6544.

The product of its digits is 24000, while the sum is 33.

The square root of 685545 is about 827.9764489404. The cubic root of 685545 is about 88.1749704019.

The spelling of 685545 in words is "six hundred eighty-five thousand, five hundred forty-five".