685790 has 32 divisors (see below), whose sum is σ = 1439424. Its totient is φ = 230400.

The previous prime is 685781. The next prime is 685793. The reversal of 685790 is 97586.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 685790.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685793) 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 15 ways as a sum of consecutive naturals, for example, 6740 + ... + 6840.

It is an arithmetic number, because the mean of its divisors is an integer number (44982).

2⁶⁸⁵⁷⁹⁰ is an apocalyptic number.

685790 is an abundant number, since it is smaller than the sum of its proper divisors (753634).

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

685790 is a wasteful number, since it uses less digits than its factorization.

685790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 685790 is about 828.1243867922. The cubic root of 685790 is about 88.1854731381.

The spelling of 685790 in words is "six hundred eighty-five thousand, seven hundred ninety".