206728 has 8 divisors (see below), whose sum is σ = 387630. Its totient is φ = 103360.

The previous prime is 206699. The next prime is 206749. The reversal of 206728 is 827602.

It can be written as a sum of positive squares in only one way, i.e., 191844 + 14884 = 438^2 + 122^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

206728 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12913 + ... + 12928.

2²⁰⁶⁷²⁸ is an apocalyptic number.

It is an amenable number.

206728 is a deficient number, since it is larger than the sum of its proper divisors (180902).

206728 is a wasteful number, since it uses less digits than its factorization.

206728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25847 (or 25843 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 206728 is about 454.6735092349. The cubic root of 206728 is about 59.1288956397.

The spelling of 206728 in words is "two hundred six thousand, seven hundred twenty-eight".