256047305 has 8 divisors (see below), whose sum is σ = 313794432. Its totient is φ = 200479408.

The previous prime is 256047299. The next prime is 256047307. The reversal of 256047305 is 503740652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256047305 - 2⁸ = 256047049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256047307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 544547 + ... + 545016.

It is an arithmetic number, because the mean of its divisors is an integer number (39224304).

Almost surely, 2^256047305 is an apocalyptic number.

It is an amenable number.

256047305 is a deficient number, since it is larger than the sum of its proper divisors (57747127).

256047305 is a wasteful number, since it uses less digits than its factorization.

256047305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089615.

The product of its (nonzero) digits is 25200, while the sum is 32.

The square root of 256047305 is about 16001.4782129652. The cubic root of 256047305 is about 634.9995287987. Note that the first 3 decimals are identical.

Adding to 256047305 its reverse (503740652), we get a palindrome (759787957).

The spelling of 256047305 in words is "two hundred fifty-six million, forty-seven thousand, three hundred five".