256505570 has 8 divisors (see below), whose sum is σ = 461710044. Its totient is φ = 102602224.

The previous prime is 256505569. The next prime is 256505573. The reversal of 256505570 is 75505652.

It can be written as a sum of positive squares in 2 ways, for example, as 256416169 + 89401 = 16013^2 + 299^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 256505570.

It is not an unprimeable number, because it can be changed into a prime (256505573) 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, 12825269 + ... + 12825288.

Almost surely, 2^256505570 is an apocalyptic number.

256505570 is a deficient number, since it is larger than the sum of its proper divisors (205204474).

256505570 is a wasteful number, since it uses less digits than its factorization.

256505570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25650564.

The product of its (nonzero) digits is 52500, while the sum is 35.

The square root of 256505570 is about 16015.7912698686. The cubic root of 256505570 is about 635.3781367350.

The spelling of 256505570 in words is "two hundred fifty-six million, five hundred five thousand, five hundred seventy".