208528689 has 4 divisors (see below), whose sum is σ = 278038256. Its totient is φ = 139019124.

The previous prime is 208528679. The next prime is 208528693. The reversal of 208528689 is 986825802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 208528689 - 2⁴ = 208528673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208528669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34754779 + ... + 34754784.

It is an arithmetic number, because the mean of its divisors is an integer number (69509564).

Almost surely, 2^208528689 is an apocalyptic number.

It is an amenable number.

208528689 is a deficient number, since it is larger than the sum of its proper divisors (69509567).

208528689 is an equidigital number, since it uses as much as digits as its factorization.

208528689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69509566.

The product of its (nonzero) digits is 552960, while the sum is 48.

The square root of 208528689 is about 14440.5224628474. The cubic root of 208528689 is about 593.0007886642. Note that the first 3 decimals are identical.

The spelling of 208528689 in words is "two hundred eight million, five hundred twenty-eight thousand, six hundred eighty-nine".