685755 has 36 divisors (see below), whose sum is σ = 1387152. Its totient is φ = 312480.

The previous prime is 685753. The next prime is 685759. The reversal of 685755 is 557586.

It is not a de Polignac number, because 685755 - 2¹ = 685753 is a prime.

Its product of digits (42000) is a multiple of the sum of its prime factors (336).

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (685753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2050 + ... + 2360.

It is an arithmetic number, because the mean of its divisors is an integer number (38532).

2⁶⁸⁵⁷⁵⁵ is an apocalyptic number.

685755 is an abundant number, since it is smaller than the sum of its proper divisors (701397).

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

685755 is a wasteful number, since it uses less digits than its factorization.

685755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336 (or 326 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 685755 is about 828.1032544315. The cubic root of 685755 is about 88.1839729004.

The spelling of 685755 in words is "six hundred eighty-five thousand, seven hundred fifty-five".