208990690 has 64 divisors (see below), whose sum is σ = 424569600. Its totient is φ = 73598976.

The previous prime is 208990687. The next prime is 208990699. The reversal of 208990690 is 96099802.

It is a super-2 number, since 2×208990690² = 87354217013352200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (208990699) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 287107 + ... + 287833.

It is an arithmetic number, because the mean of its divisors is an integer number (6633900).

Almost surely, 2^208990690 is an apocalyptic number.

208990690 is an abundant number, since it is smaller than the sum of its proper divisors (215578910).

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

208990690 is a wasteful number, since it uses less digits than its factorization.

208990690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 208990690 is about 14456.5102981321. The cubic root of 208990690 is about 593.4384021172.

The spelling of 208990690 in words is "two hundred eight million, nine hundred ninety thousand, six hundred ninety".