256400271 has 24 divisors (see below), whose sum is σ = 380796416. Its totient is φ = 166153680.

The previous prime is 256400257. The next prime is 256400299. The reversal of 256400271 is 172004652.

256400271 is a `hidden beast` number, since 256 + 400 + 2 + 7 + 1 = 666.

It is not a de Polignac number, because 256400271 - 2¹¹ = 256398223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256400201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84816 + ... + 87786.

Almost surely, 2^256400271 is an apocalyptic number.

256400271 is a deficient number, since it is larger than the sum of its proper divisors (124396145).

256400271 is a wasteful number, since it uses less digits than its factorization.

256400271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3243 (or 3240 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 256400271 is about 16012.5035831378. The cubic root of 256400271 is about 635.2911810670.

The spelling of 256400271 in words is "two hundred fifty-six million, four hundred thousand, two hundred seventy-one".