256444442 has 4 divisors (see below), whose sum is σ = 384666666. Its totient is φ = 128222220.

The previous prime is 256444393. The next prime is 256444459. The reversal of 256444442 is 244444652.

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

It can be written as a sum of positive squares in only one way, i.e., 247086961 + 9357481 = 15719^2 + 3059^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64111109 + ... + 64111112.

Almost surely, 2^256444442 is an apocalyptic number.

256444442 is a deficient number, since it is larger than the sum of its proper divisors (128222224).

256444442 is a wasteful number, since it uses less digits than its factorization.

256444442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128222223.

The product of its digits is 122880, while the sum is 35.

The square root of 256444442 is about 16013.8827896298. The cubic root of 256444442 is about 635.3276602737.

The spelling of 256444442 in words is "two hundred fifty-six million, four hundred forty-four thousand, four hundred forty-two".