208799990 has 32 divisors (see below), whose sum is σ = 431348544. Its totient is φ = 71285760.

The previous prime is 208799989. The next prime is 208799999. The reversal of 208799990 is 99997802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208799999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10682 + ... + 23058.

It is an arithmetic number, because the mean of its divisors is an integer number (13479642).

Almost surely, 2^208799990 is an apocalyptic number.

208799990 is an abundant number, since it is smaller than the sum of its proper divisors (222548554).

208799990 is a wasteful number, since it uses less digits than its factorization.

208799990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12632.

The product of its (nonzero) digits is 734832, while the sum is 53.

The square root of 208799990 is about 14449.9131485279. The cubic root of 208799990 is about 593.2578467981.

The spelling of 208799990 in words is "two hundred eight million, seven hundred ninety-nine thousand, nine hundred ninety".