685090 has 16 divisors (see below), whose sum is σ = 1409472. Its totient is φ = 234864.

The previous prime is 685081. The next prime is 685093. The reversal of 685090 is 90586.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (685093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4824 + ... + 4963.

It is an arithmetic number, because the mean of its divisors is an integer number (88092).

2⁶⁸⁵⁰⁹⁰ is an apocalyptic number.

685090 is an abundant number, since it is smaller than the sum of its proper divisors (724382).

It is a weird number, because it is abundant, but not a pseudoperfect number.

685090 is a wasteful number, since it uses less digits than its factorization.

685090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9801.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 685090 is about 827.7016370650. The cubic root of 685090 is about 88.1554586798.

The spelling of 685090 in words is "six hundred eighty-five thousand, ninety".