256570005 has 16 divisors (see below), whose sum is σ = 420525504. Its totient is φ = 133499520.

The previous prime is 256569883. The next prime is 256570009. The reversal of 256570005 is 500075652.

It is not a de Polignac number, because 256570005 - 2¹⁴ = 256553621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256570009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207979 + ... + 209208.

It is an arithmetic number, because the mean of its divisors is an integer number (26282844).

Almost surely, 2^256570005 is an apocalyptic number.

It is an amenable number.

256570005 is a deficient number, since it is larger than the sum of its proper divisors (163955499).

256570005 is a wasteful number, since it uses less digits than its factorization.

256570005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417236.

The product of its (nonzero) digits is 10500, while the sum is 30.

The square root of 256570005 is about 16017.8027519382. The cubic root of 256570005 is about 635.4313352713.

The spelling of 256570005 in words is "two hundred fifty-six million, five hundred seventy thousand, five".