208740990 has 16 divisors (see below), whose sum is σ = 500978448. Its totient is φ = 55664256.

The previous prime is 208740971. The next prime is 208741007. The reversal of 208740990 is 99047802.

208740990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3478987 + ... + 3479046.

It is an arithmetic number, because the mean of its divisors is an integer number (31311153).

Almost surely, 2^208740990 is an apocalyptic number.

208740990 is an abundant number, since it is smaller than the sum of its proper divisors (292237458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

208740990 is a wasteful number, since it uses less digits than its factorization.

208740990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6958043.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 208740990 is about 14447.8714695280. The cubic root of 208740990 is about 593.2019631583.

The spelling of 208740990 in words is "two hundred eight million, seven hundred forty thousand, nine hundred ninety".