256228073 has 4 divisors (see below), whose sum is σ = 267368448. Its totient is φ = 245087700.

The previous prime is 256228069. The next prime is 256228081. The reversal of 256228073 is 370822652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256228073 - 2² = 256228069 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256228673) 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 3 ways as a sum of consecutive naturals, for example, 5570153 + ... + 5570198.

It is an arithmetic number, because the mean of its divisors is an integer number (66842112).

Almost surely, 2^256228073 is an apocalyptic number.

256228073 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

256228073 is a deficient number, since it is larger than the sum of its proper divisors (11140375).

256228073 is a wasteful number, since it uses less digits than its factorization.

256228073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11140374.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 256228073 is about 16007.1256945149. The cubic root of 256228073 is about 635.1489290463.

The spelling of 256228073 in words is "two hundred fifty-six million, two hundred twenty-eight thousand, seventy-three".