208270838689 has 3 divisors (see below), whose sum is σ = 208271295057. Its totient is φ = 208270382322.

The previous prime is 208270838683. The next prime is 208270838707. The reversal of 208270838689 is 986838072802.

The square root of 208270838689 is 456367.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 208270838689 - 2⁷ = 208270838561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208270838683) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 228184 + ... + 684550.

It is an arithmetic number, because the mean of its divisors is an integer number (69423765019).

Almost surely, 2^208270838689 is an apocalyptic number.

208270838689 is the 456367-th square number.

208270838689 is the 228184-th centered octagonal number.

It is an amenable number.

208270838689 is a deficient number, since it is larger than the sum of its proper divisors (456368).

208270838689 is an frugal number, since it uses more digits than its factorization.

208270838689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912734 (or 456367 counting only the distinct ones).

The product of its (nonzero) digits is 18579456, while the sum is 61.

The spelling of 208270838689 in words is "two hundred eight billion, two hundred seventy million, eight hundred thirty-eight thousand, six hundred eighty-nine".