208990663 has 8 divisors (see below), whose sum is σ = 238968320. Its totient is φ = 179043480.

The previous prime is 208990657. The next prime is 208990669. The reversal of 208990663 is 366099802.

It is an interprime number because it is at equal distance from previous prime (208990657) and next prime (208990669).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 208990663 - 2⁵ = 208990631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208990669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9718 + ... + 22636.

It is an arithmetic number, because the mean of its divisors is an integer number (29871040).

Almost surely, 2^208990663 is an apocalyptic number.

208990663 is a deficient number, since it is larger than the sum of its proper divisors (29977657).

208990663 is a wasteful number, since it uses less digits than its factorization.

208990663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15237.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 208990663 is about 14456.5093642968. The cubic root of 208990663 is about 593.4383765613.

The spelling of 208990663 in words is "two hundred eight million, nine hundred ninety thousand, six hundred sixty-three".