208828321 has 8 divisors (see below), whose sum is σ = 229136040. Its totient is φ = 189126912.

The previous prime is 208828313. The next prime is 208828327. The reversal of 208828321 is 123828802.

It can be written as a sum of positive squares in 4 ways, for example, as 314721 + 208513600 = 561^2 + 14440^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 208828321 - 2³ = 208828313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208828327) 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, 150856 + ... + 152233.

It is an arithmetic number, because the mean of its divisors is an integer number (28642005).

Almost surely, 2^208828321 is an apocalyptic number.

It is an amenable number.

208828321 is a deficient number, since it is larger than the sum of its proper divisors (20307719).

208828321 is a wasteful number, since it uses less digits than its factorization.

208828321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303155.

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 208828321 is about 14450.8934325875. The cubic root of 208828321 is about 593.2846776230.

The spelling of 208828321 in words is "two hundred eight million, eight hundred twenty-eight thousand, three hundred twenty-one".