206668 has 36 divisors (see below), whose sum is σ = 461776. Its totient is φ = 79200.

The previous prime is 206651. The next prime is 206699. The reversal of 206668 is 866602.

It is a happy number.

206668 is nontrivially palindromic in base 3.

206668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3358 + ... + 3418.

2²⁰⁶⁶⁶⁸ is an apocalyptic number.

206668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230888).

206668 is an abundant number, since it is smaller than the sum of its proper divisors (255108).

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

206668 is a wasteful number, since it uses less digits than its factorization.

206668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94 (or 81 counting only the distinct ones).

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

The square root of 206668 is about 454.6075230350. The cubic root of 206668 is about 59.1231746327.

206668 divided by its sum of digits (28) gives a triangular number (7381 = T₁₂₁).

The spelling of 206668 in words is "two hundred six thousand, six hundred sixty-eight".