685278 has 24 divisors (see below), whose sum is σ = 1620216. Its totient is φ = 207600.

The previous prime is 685271. The next prime is 685297. The reversal of 685278 is 872586.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1533 + ... + 1928.

It is an arithmetic number, because the mean of its divisors is an integer number (67509).

2⁶⁸⁵²⁷⁸ is an apocalyptic number.

685278 is an abundant number, since it is smaller than the sum of its proper divisors (934938).

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

685278 is a wasteful number, since it uses less digits than its factorization.

685278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3480 (or 3477 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 685278 is about 827.8151967680. The cubic root of 685278 is about 88.1635217131.

The spelling of 685278 in words is "six hundred eighty-five thousand, two hundred seventy-eight".