686620 has 24 divisors (see below), whose sum is σ = 1573488. Its totient is φ = 249600.

The previous prime is 686611. The next prime is 686639. The reversal of 686620 is 26686.

It is a happy number.

686620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 1341 + ... + 1780.

It is an arithmetic number, because the mean of its divisors is an integer number (65562).

2⁶⁸⁶⁶²⁰ is an apocalyptic number.

It is an amenable number.

686620 is an abundant number, since it is smaller than the sum of its proper divisors (886868).

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

686620 is a wasteful number, since it uses less digits than its factorization.

686620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3141 (or 3139 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 686620 is about 828.6253677024. The cubic root of 686620 is about 88.2210352558.

It can be divided in two parts, 6866 and 20, that added together give a palindrome (6886).

The spelling of 686620 in words is "six hundred eighty-six thousand, six hundred twenty".