685144 has 8 divisors (see below), whose sum is σ = 1284660. Its totient is φ = 342568.

The previous prime is 685141. The next prime is 685169. The reversal of 685144 is 441586.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42814 + ... + 42829.

2⁶⁸⁵¹⁴⁴ is an apocalyptic number.

It is an amenable number.

685144 is a deficient number, since it is larger than the sum of its proper divisors (599516).

685144 is a wasteful number, since it uses less digits than its factorization.

685144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85649 (or 85645 counting only the distinct ones).

The product of its digits is 3840, while the sum is 28.

The square root of 685144 is about 827.7342568723. The cubic root of 685144 is about 88.1577748084.

The spelling of 685144 in words is "six hundred eighty-five thousand, one hundred forty-four".