206288090 has 8 divisors (see below), whose sum is σ = 371318580. Its totient is φ = 82515232.

The previous prime is 206288087. The next prime is 206288099. The reversal of 206288090 is 90882602.

It can be written as a sum of positive squares in 2 ways, for example, as 194295721 + 11992369 = 13939^2 + 3463^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 206288090.

It is not an unprimeable number, because it can be changed into a prime (206288099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10314395 + ... + 10314414.

Almost surely, 2^206288090 is an apocalyptic number.

206288090 is a deficient number, since it is larger than the sum of its proper divisors (165030490).

206288090 is a wasteful number, since it uses less digits than its factorization.

206288090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20628816.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 206288090 is about 14362.7326787071. The cubic root of 206288090 is about 590.8692444280.

The spelling of 206288090 in words is "two hundred six million, two hundred eighty-eight thousand, ninety".