685554 has 8 divisors (see below), whose sum is σ = 1371120. Its totient is φ = 228516.

The previous prime is 685547. The next prime is 685591. The reversal of 685554 is 455586.

It is a sphenic number, since it is the product of 3 distinct primes.

685554 is an admirable number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 685554.

It is an unprimeable number.

685554 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, 57124 + ... + 57135.

It is an arithmetic number, because the mean of its divisors is an integer number (171390).

2⁶⁸⁵⁵⁵⁴ is an apocalyptic number.

685554 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

685554 is a wasteful number, since it uses less digits than its factorization.

685554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114264.

The product of its digits is 24000, while the sum is 33.

The square root of 685554 is about 827.9818838598. The cubic root of 685554 is about 88.1753562610.

The spelling of 685554 in words is "six hundred eighty-five thousand, five hundred fifty-four".