256228447 has 4 divisors (see below), whose sum is σ = 261063000. Its totient is φ = 251393896.

The previous prime is 256228439. The next prime is 256228459. The reversal of 256228447 is 744822652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256228447 - 2³ = 256228439 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 (256228417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2417197 + ... + 2417302.

It is an arithmetic number, because the mean of its divisors is an integer number (65265750).

Almost surely, 2^256228447 is an apocalyptic number.

256228447 is a deficient number, since it is larger than the sum of its proper divisors (4834553).

256228447 is an equidigital number, since it uses as much as digits as its factorization.

256228447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4834552.

The product of its digits is 215040, while the sum is 40.

The square root of 256228447 is about 16007.1373768079. The cubic root of 256228447 is about 635.1492380751.

The spelling of 256228447 in words is "two hundred fifty-six million, two hundred twenty-eight thousand, four hundred forty-seven".