685788 has 12 divisors (see below), whose sum is σ = 1600200. Its totient is φ = 228592.

The previous prime is 685781. The next prime is 685793. The reversal of 685788 is 887586.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a plaindrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 685788.

It is not an unprimeable number, because it can be changed into a prime (685781) by changing a digit.

685788 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28563 + ... + 28586.

It is an arithmetic number, because the mean of its divisors is an integer number (133350).

2⁶⁸⁵⁷⁸⁸ is an apocalyptic number.

It is an amenable number.

685788 is an abundant number, since it is smaller than the sum of its proper divisors (914412).

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

685788 is a wasteful number, since it uses less digits than its factorization.

685788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57156 (or 57154 counting only the distinct ones).

The product of its digits is 107520, while the sum is 42.

The square root of 685788 is about 828.1231792433. The cubic root of 685788 is about 88.1853874116.

It can be divided in two parts, 68578 and 8, that added together give a palindrome (68586).

The spelling of 685788 in words is "six hundred eighty-five thousand, seven hundred eighty-eight".