684285 has 40 divisors (see below), whose sum is σ = 1344480. Its totient is φ = 296352.

The previous prime is 684269. The next prime is 684287. The reversal of 684285 is 582486.

It is not a de Polignac number, because 684285 - 2⁴ = 684269 is a prime.

It is a super-2 number, since 2×684285² = 936491922450, which contains 22 as substring.

684285 is a lucky number.

It is a nialpdrome in base 7.

It is a zygodrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684287) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 36006 + ... + 36024.

It is an arithmetic number, because the mean of its divisors is an integer number (33612).

2⁶⁸⁴²⁸⁵ is an apocalyptic number.

It is an amenable number.

684285 is a deficient number, since it is larger than the sum of its proper divisors (660195).

684285 is an equidigital number, since it uses as much as digits as its factorization.

684285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55 (or 34 counting only the distinct ones).

The product of its digits is 15360, while the sum is 33.

The square root of 684285 is about 827.2152077906. The cubic root of 684285 is about 88.1209167667.

It can be divided in two parts, 684 and 285, that added together give a palindrome (969).

The spelling of 684285 in words is "six hundred eighty-four thousand, two hundred eighty-five".