256206005 has 12 divisors (see below), whose sum is σ = 337938636. Its totient is φ = 186331200.

The previous prime is 256205969. The next prime is 256206017. The reversal of 256206005 is 500602652.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 34374769 + 221831236 = 5863^2 + 14894^2 .

It is not a de Polignac number, because 256206005 - 2⁶ = 256205941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 211136 + ... + 212345.

It is an arithmetic number, because the mean of its divisors is an integer number (28161553).

Almost surely, 2^256206005 is an apocalyptic number.

It is an amenable number.

256206005 is a deficient number, since it is larger than the sum of its proper divisors (81732631).

256206005 is a wasteful number, since it uses less digits than its factorization.

256206005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423508 (or 423497 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 256206005 is about 16006.4363616640. The cubic root of 256206005 is about 635.1306941604.

Adding to 256206005 its reverse (500602652), we get a palindrome (756808657).

The spelling of 256206005 in words is "two hundred fifty-six million, two hundred six thousand, five".