206828657 has 8 divisors (see below), whose sum is σ = 241200000. Its totient is φ = 177281412.

The previous prime is 206828653. The next prime is 206828669. The reversal of 206828657 is 756828602.

It is not a de Polignac number, because 206828657 - 2² = 206828653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206828651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301157 + ... + 301842.

It is an arithmetic number, because the mean of its divisors is an integer number (30150000).

Almost surely, 2^206828657 is an apocalyptic number.

It is an amenable number.

206828657 is a deficient number, since it is larger than the sum of its proper divisors (34371343).

206828657 is an frugal number, since it uses more digits than its factorization.

206828657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603020 (or 603006 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 206828657 is about 14381.5387563362. The cubic root of 206828657 is about 591.3849081069.

Subtracting 206828657 from its reverse (756828602), we obtain a palindrome (549999945).

The spelling of 206828657 in words is "two hundred six million, eight hundred twenty-eight thousand, six hundred fifty-seven".