685552 has 20 divisors (see below), whose sum is σ = 1518256. Its totient is φ = 293760.

The previous prime is 685547. The next prime is 685591. The reversal of 685552 is 255586.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2949 + ... + 3172.

2⁶⁸⁵⁵⁵² is an apocalyptic number.

It is an amenable number.

685552 is an abundant number, since it is smaller than the sum of its proper divisors (832704).

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

685552 is a wasteful number, since it uses less digits than its factorization.

685552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6136 (or 6130 counting only the distinct ones).

The product of its digits is 12000, while the sum is 31.

The square root of 685552 is about 827.9806761030. The cubic root of 685552 is about 88.1752705148.

It can be divided in two parts, 6 and 85552, that added together give a palindrome (85558).

The spelling of 685552 in words is "six hundred eighty-five thousand, five hundred fifty-two".