686530 has 16 divisors (see below), whose sum is σ = 1331064. Its totient is φ = 253440.

The previous prime is 686519. The next prime is 686551. The reversal of 686530 is 35686.

686530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 288369 + 398161 = 537^2 + 631^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2511 + ... + 2770.

2⁶⁸⁶⁵³⁰ is an apocalyptic number.

686530 is a deficient number, since it is larger than the sum of its proper divisors (644534).

686530 is a wasteful number, since it uses less digits than its factorization.

686530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5301.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 686530 is about 828.5710591132. The cubic root of 686530 is about 88.2171805083.

The spelling of 686530 in words is "six hundred eighty-six thousand, five hundred thirty".