208890265 has 4 divisors (see below), whose sum is σ = 250668324. Its totient is φ = 167112208.

The previous prime is 208890257. The next prime is 208890281. The reversal of 208890265 is 562098802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 101062809 + 107827456 = 10053^2 + 10384^2 .

It is a cyclic number.

It is not a de Polignac number, because 208890265 - 2³ = 208890257 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20889022 + ... + 20889031.

It is an arithmetic number, because the mean of its divisors is an integer number (62667081).

Almost surely, 2^208890265 is an apocalyptic number.

It is an amenable number.

208890265 is a deficient number, since it is larger than the sum of its proper divisors (41778059).

208890265 is an equidigital number, since it uses as much as digits as its factorization.

208890265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41778058.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 208890265 is about 14453.0365321617. The cubic root of 208890265 is about 593.3433331297.

The spelling of 208890265 in words is "two hundred eight million, eight hundred ninety thousand, two hundred sixty-five".