208564990 has 16 divisors (see below), whose sum is σ = 376261200. Its totient is φ = 83238400.

The previous prime is 208564963. The next prime is 208565011. The reversal of 208564990 is 99465802.

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, 18736 + ... + 27715.

It is an arithmetic number, because the mean of its divisors is an integer number (23516325).

Almost surely, 2^208564990 is an apocalyptic number.

208564990 is a deficient number, since it is larger than the sum of its proper divisors (167696210).

208564990 is a wasteful number, since it uses less digits than its factorization.

208564990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46907.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 208564990 is about 14441.7793225073. The cubic root of 208564990 is about 593.0351968356.

The spelling of 208564990 in words is "two hundred eight million, five hundred sixty-four thousand, nine hundred ninety".