208004781988 has 6 divisors (see below), whose sum is σ = 364008368486. Its totient is φ = 104002390992.

The previous prime is 208004781977. The next prime is 208004781997. The reversal of 208004781988 is 889187400802.

It can be written as a sum of positive squares in only one way, i.e., 190115184484 + 17889597504 = 436022^2 + 133752^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26000597745 + ... + 26000597752.

Almost surely, 2^208004781988 is an apocalyptic number.

It is an amenable number.

208004781988 is a deficient number, since it is larger than the sum of its proper divisors (156003586498).

208004781988 is a wasteful number, since it uses less digits than its factorization.

208004781988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52001195501 (or 52001195499 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 55.

The spelling of 208004781988 in words is "two hundred eight billion, four million, seven hundred eighty-one thousand, nine hundred eighty-eight".