208905408290 has 16 divisors (see below), whose sum is σ = 380560215168. Its totient is φ = 82555389936.

The previous prime is 208905408289. The next prime is 208905408353. The reversal of 208905408290 is 92804509802.

208905408290 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×208905408290² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125845802 + ... + 125847461.

It is an arithmetic number, because the mean of its divisors is an integer number (23785013448).

Almost surely, 2^208905408290 is an apocalyptic number.

208905408290 is a deficient number, since it is larger than the sum of its proper divisors (171654806878).

208905408290 is a wasteful number, since it uses less digits than its factorization.

208905408290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251693353.

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 208905408290 in words is "two hundred eight billion, nine hundred five million, four hundred eight thousand, two hundred ninety".