685872 has 60 divisors (see below), whose sum is σ = 2098824. Its totient is φ = 207360.

The previous prime is 685859. The next prime is 685907. The reversal of 685872 is 278586.

685872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1368 + ... + 1800.

2⁶⁸⁵⁸⁷² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1049412).

685872 is an abundant number, since it is smaller than the sum of its proper divisors (1412952).

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

685872 is a wasteful number, since it uses less digits than its factorization.

685872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458 (or 449 counting only the distinct ones).

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

The square root of 685872 is about 828.1738947830. The cubic root of 685872 is about 88.1889877809.

The spelling of 685872 in words is "six hundred eighty-five thousand, eight hundred seventy-two".