208138073288 has 8 divisors (see below), whose sum is σ = 390258887430. Its totient is φ = 104069036640.

The previous prime is 208138073257. The next prime is 208138073323. The reversal of 208138073288 is 882370831802.

It can be written as a sum of positive squares in only one way, i.e., 123874433764 + 84263639524 = 351958^2 + 290282^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13008629573 + ... + 13008629588.

Almost surely, 2^208138073288 is an apocalyptic number.

It is an amenable number.

208138073288 is a deficient number, since it is larger than the sum of its proper divisors (182120814142).

208138073288 is a wasteful number, since it uses less digits than its factorization.

208138073288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26017259167 (or 26017259163 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 50.

The spelling of 208138073288 in words is "two hundred eight billion, one hundred thirty-eight million, seventy-three thousand, two hundred eighty-eight".