206528638 has 16 divisors (see below), whose sum is σ = 326470176. Its totient is φ = 97794400.

The previous prime is 206528629. The next prime is 206528653. The reversal of 206528638 is 836825602.

It is a self number, because there is not a number n which added to its sum of digits gives 206528638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17581 + ... + 26872.

It is an arithmetic number, because the mean of its divisors is an integer number (20404386).

Almost surely, 2^206528638 is an apocalyptic number.

206528638 is a deficient number, since it is larger than the sum of its proper divisors (119941538).

206528638 is a wasteful number, since it uses less digits than its factorization.

206528638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44579.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 206528638 is about 14371.1042721149. The cubic root of 206528638 is about 591.0988217551.

It can be divided in two parts, 2065 and 28638, that added together give a palindrome (30703).

The spelling of 206528638 in words is "two hundred six million, five hundred twenty-eight thousand, six hundred thirty-eight".