256055215 has 16 divisors (see below), whose sum is σ = 331537248. Its totient is φ = 188724096.

The previous prime is 256055213. The next prime is 256055237. The reversal of 256055215 is 512550652.

It is a cyclic number.

It is not a de Polignac number, because 256055215 - 2¹ = 256055213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256055213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33097 + ... + 40093.

It is an arithmetic number, because the mean of its divisors is an integer number (20721078).

Almost surely, 2^256055215 is an apocalyptic number.

256055215 is a deficient number, since it is larger than the sum of its proper divisors (75482033).

256055215 is a wasteful number, since it uses less digits than its factorization.

256055215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7578.

The product of its (nonzero) digits is 15000, while the sum is 31.

The square root of 256055215 is about 16001.7253757212. The cubic root of 256055215 is about 635.0060676875.

It can be divided in two parts, 2560 and 55215, that added together give a palindrome (57775).

The spelling of 256055215 in words is "two hundred fifty-six million, fifty-five thousand, two hundred fifteen".