256243671 has 24 divisors (see below), whose sum is σ = 397912320. Its totient is φ = 158389776.

The previous prime is 256243657. The next prime is 256243693. The reversal of 256243671 is 176342652.

256243671 is a `hidden beast` number, since 25 + 624 + 3 + 6 + 7 + 1 = 666.

It is not a de Polignac number, because 256243671 - 2⁶ = 256243607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256243271) 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, 7905 + ... + 23978.

It is an arithmetic number, because the mean of its divisors is an integer number (16579680).

Almost surely, 2^256243671 is an apocalyptic number.

256243671 is a deficient number, since it is larger than the sum of its proper divisors (141668649).

256243671 is a wasteful number, since it uses less digits than its factorization.

256243671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31955 (or 31952 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 256243671 is about 16007.6129076137. The cubic root of 256243671 is about 635.1618171110.

The spelling of 256243671 in words is "two hundred fifty-six million, two hundred forty-three thousand, six hundred seventy-one".