256004805 has 32 divisors (see below), whose sum is σ = 468762624. Its totient is φ = 116870976.

The previous prime is 256004783. The next prime is 256004809. The reversal of 256004805 is 508400652.

It is not a de Polignac number, because 256004805 - 2⁵ = 256004773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256004809) 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, 113014 + ... + 115256.

It is an arithmetic number, because the mean of its divisors is an integer number (14648832).

Almost surely, 2^256004805 is an apocalyptic number.

It is an amenable number.

256004805 is a deficient number, since it is larger than the sum of its proper divisors (212757819).

256004805 is a wasteful number, since it uses less digits than its factorization.

256004805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3345.

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 256004805 is about 16000.1501555454. The cubic root of 256004805 is about 634.9643933989.

The spelling of 256004805 in words is "two hundred fifty-six million, four thousand, eight hundred five".