686028 has 24 divisors (see below), whose sum is σ = 1829632. Its totient is φ = 195984.

The previous prime is 686027. The next prime is 686029. The reversal of 686028 is 820686.

It is an interprime number because it is at equal distance from previous prime (686027) and next prime (686029).

It is a junction number, because it is equal to n+sod(n) for n = 685986 and 686004.

It is not an unprimeable number, because it can be changed into a prime (686027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4000 + ... + 4167.

2⁶⁸⁶⁰²⁸ is an apocalyptic number.

It is an amenable number.

686028 is an abundant number, since it is smaller than the sum of its proper divisors (1143604).

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

686028 is a wasteful number, since it uses less digits than its factorization.

686028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8181 (or 8179 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 686028 is about 828.2680725466. The cubic root of 686028 is about 88.1956734011.

It can be divided in two parts, 68 and 6028, that multiplied together give a palindrome (409904).

The spelling of 686028 in words is "six hundred eighty-six thousand, twenty-eight".