685055 has 24 divisors (see below), whose sum is σ = 1008672. Its totient is φ = 437184.

The previous prime is 685051. The next prime is 685057. The reversal of 685055 is 550586.

685055 = T₁₀₅ + T₁₀₆ + ... + T₁₇₃.

It is not a de Polignac number, because 685055 - 2² = 685051 is a prime.

It is an Ulam number.

It is a congruent number.

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

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18497 + ... + 18533.

It is an arithmetic number, because the mean of its divisors is an integer number (42028).

2⁶⁸⁵⁰⁵⁵ is an apocalyptic number.

685055 is a deficient number, since it is larger than the sum of its proper divisors (323617).

685055 is a wasteful number, since it uses less digits than its factorization.

685055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 685055 is about 827.6804939105. The cubic root of 685055 is about 88.1539574203.

The spelling of 685055 in words is "six hundred eighty-five thousand, fifty-five".