208909328356 has 27 divisors (see below), whose sum is σ = 367995357723. Its totient is φ = 103772264640.

The previous prime is 208909328237. The next prime is 208909328363. The reversal of 208909328356 is 653823909802.

The square root of 208909328356 is 457066.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 145916360100 + 62992968256 = 381990^2 + 250984^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 208909328297 and 208909328306.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 158144176 + ... + 158145496.

Almost surely, 2^208909328356 is an apocalyptic number.

208909328356 is the 457066-th square number.

It is an amenable number.

208909328356 is a deficient number, since it is larger than the sum of its proper divisors (159086029367).

208909328356 is an frugal number, since it uses more digits than its factorization.

208909328356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2992 (or 1496 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 55.

The spelling of 208909328356 in words is "two hundred eight billion, nine hundred nine million, three hundred twenty-eight thousand, three hundred fifty-six".