685548 has 36 divisors (see below), whose sum is σ = 1758120. Its totient is φ = 225216.

The previous prime is 685547. The next prime is 685591. The reversal of 685548 is 845586.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 685548.

It is not an unprimeable number, because it can be changed into a prime (685541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4863 + ... + 5001.

2⁶⁸⁵⁵⁴⁸ is an apocalyptic number.

It is an amenable number.

685548 is an abundant number, since it is smaller than the sum of its proper divisors (1072572).

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

685548 is a wasteful number, since it uses less digits than its factorization.

685548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 281 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 685548 is about 827.9782605842. The cubic root of 685548 is about 88.1750990220.

Adding to 685548 its sum of digits (36), we get a square (685584 = 828²).

It can be divided in two parts, 6855 and 48, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 685548 in words is "six hundred eighty-five thousand, five hundred forty-eight".