206864 has 20 divisors (see below), whose sum is σ = 458304. Its totient is φ = 88608.

The previous prime is 206827. The next prime is 206879. The reversal of 206864 is 468602.

It is a plaindrome in base 9.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 206864.

It is an unprimeable number.

206864 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 812 + ... + 1035.

2²⁰⁶⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

206864 is an abundant number, since it is smaller than the sum of its proper divisors (251440).

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

206864 is a wasteful number, since it uses less digits than its factorization.

206864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1862 (or 1856 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 206864 is about 454.8230425121. The cubic root of 206864 is about 59.1418591586.

The spelling of 206864 in words is "two hundred six thousand, eight hundred sixty-four".