206564087 has 4 divisors (see below), whose sum is σ = 206696160. Its totient is φ = 206432016.

The previous prime is 206564041. The next prime is 206564101. The reversal of 206564087 is 780465602.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 206564087 - 2⁸ = 206563831 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206564087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206564287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63662 + ... + 66827.

It is an arithmetic number, because the mean of its divisors is an integer number (51674040).

Almost surely, 2^206564087 is an apocalyptic number.

206564087 is a deficient number, since it is larger than the sum of its proper divisors (132073).

206564087 is a wasteful number, since it uses less digits than its factorization.

206564087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132072.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 206564087 is about 14372.3375621365. The cubic root of 206564087 is about 591.1326389594.

The spelling of 206564087 in words is "two hundred six million, five hundred sixty-four thousand, eighty-seven".