685355 has 16 divisors (see below), whose sum is σ = 951264. Its totient is φ = 468480.

The previous prime is 685339. The next prime is 685361. The reversal of 685355 is 553586.

685355 = 26² + 27² + ... + 127².

It is not a de Polignac number, because 685355 - 2⁴ = 685339 is a prime.

It is a super-2 number, since 2×685355² = 939422952050, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 569 + ... + 1301.

It is an arithmetic number, because the mean of its divisors is an integer number (59454).

2⁶⁸⁵³⁵⁵ is an apocalyptic number.

685355 is a deficient number, since it is larger than the sum of its proper divisors (265909).

685355 is a wasteful number, since it uses less digits than its factorization.

685355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766.

The product of its digits is 18000, while the sum is 32.

The square root of 685355 is about 827.8617034264. The cubic root of 685355 is about 88.1668237000.

Subtracting from 685355 its reverse (553586), we obtain a square (131769 = 363²).

The spelling of 685355 in words is "six hundred eighty-five thousand, three hundred fifty-five".