686090 has 32 divisors (see below), whose sum is σ = 1365120. Its totient is φ = 247104.

The previous prime is 686089. The next prime is 686099. The reversal of 686090 is 90686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4292 + ... + 4448.

It is an arithmetic number, because the mean of its divisors is an integer number (42660).

2⁶⁸⁶⁰⁹⁰ is an apocalyptic number.

686090 is a deficient number, since it is larger than the sum of its proper divisors (679030).

686090 is a wasteful number, since it uses less digits than its factorization.

686090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 686090 is about 828.3054991970. The cubic root of 686090 is about 88.1983302252.

The spelling of 686090 in words is "six hundred eighty-six thousand, ninety".