256057505 has 32 divisors (see below), whose sum is σ = 358380288. Its totient is φ = 173747200.

The previous prime is 256057481. The next prime is 256057507. The reversal of 256057505 is 505750652.

It is not a de Polignac number, because 256057505 - 2⁶ = 256057441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256057507) by changing a digit.

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 in 31 ways as a sum of consecutive naturals, for example, 49397 + ... + 54333.

It is an arithmetic number, because the mean of its divisors is an integer number (11199384).

Almost surely, 2^256057505 is an apocalyptic number.

It is an amenable number.

256057505 is a deficient number, since it is larger than the sum of its proper divisors (102322783).

256057505 is a wasteful number, since it uses less digits than its factorization.

256057505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5017.

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

The square root of 256057505 is about 16001.7969303450. The cubic root of 256057505 is about 635.0079607161.

The spelling of 256057505 in words is "two hundred fifty-six million, fifty-seven thousand, five hundred five".