685066 has 8 divisors (see below), whose sum is σ = 1088100. Its totient is φ = 322368.

The previous prime is 685063. The next prime is 685073. The reversal of 685066 is 660586.

It can be written as a sum of positive squares in 2 ways, for example, as 674041 + 11025 = 821^2 + 105^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10041 + ... + 10108.

2⁶⁸⁵⁰⁶⁶ is an apocalyptic number.

685066 is a deficient number, since it is larger than the sum of its proper divisors (403034).

685066 is a wasteful number, since it uses less digits than its factorization.

685066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20168.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 685066 is about 827.6871389601. The cubic root of 685066 is about 88.1544292502.

Subtracting from 685066 its sum of digits (31), we obtain a triangular number (685035 = T₁₁₇₀).

The spelling of 685066 in words is "six hundred eighty-five thousand, sixty-six".