256255305 has 32 divisors (see below), whose sum is σ = 430755840. Its totient is φ = 129835200.

The previous prime is 256255301. The next prime is 256255313. The reversal of 256255305 is 503552652.

It is not a de Polignac number, because 256255305 - 2² = 256255301 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256255301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49636 + ... + 54554.

It is an arithmetic number, because the mean of its divisors is an integer number (13461120).

Almost surely, 2^256255305 is an apocalyptic number.

It is an amenable number.

256255305 is a deficient number, since it is larger than the sum of its proper divisors (174500535).

256255305 is a wasteful number, since it uses less digits than its factorization.

256255305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5101.

The product of its (nonzero) digits is 45000, while the sum is 33.

The square root of 256255305 is about 16007.9762930859. The cubic root of 256255305 is about 635.1714295250.

The spelling of 256255305 in words is "two hundred fifty-six million, two hundred fifty-five thousand, three hundred five".