256504442 has 8 divisors (see below), whose sum is σ = 385514100. Its totient is φ = 127999744.

The previous prime is 256504429. The next prime is 256504453. The reversal of 256504442 is 244405652.

It can be written as a sum of positive squares in 2 ways, for example, as 252460321 + 4044121 = 15889^2 + 2011^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 256504399 and 256504408.

It is an unprimeable number.

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, 124967 + ... + 127002.

Almost surely, 2^256504442 is an apocalyptic number.

256504442 is a deficient number, since it is larger than the sum of its proper divisors (129009658).

256504442 is a wasteful number, since it uses less digits than its factorization.

256504442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252480.

The product of its (nonzero) digits is 38400, while the sum is 32.

The square root of 256504442 is about 16015.7560545857. The cubic root of 256504442 is about 635.3772053614.

The spelling of 256504442 in words is "two hundred fifty-six million, five hundred four thousand, four hundred forty-two".