256685471 has 24 divisors (see below), whose sum is σ = 306913536. Its totient is φ = 213949680.

The previous prime is 256685419. The next prime is 256685477. The reversal of 256685471 is 174586652.

It is not a de Polignac number, because 256685471 - 2¹⁸ = 256423327 is a prime.

It is a super-3 number, since 3×256685471³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256685477) 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, 522536 + ... + 523026.

It is an arithmetic number, because the mean of its divisors is an integer number (12788064).

Almost surely, 2^256685471 is an apocalyptic number.

256685471 is a deficient number, since it is larger than the sum of its proper divisors (50228065).

256685471 is a wasteful number, since it uses less digits than its factorization.

256685471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779 (or 772 counting only the distinct ones).

The product of its digits is 403200, while the sum is 44.

The square root of 256685471 is about 16021.4066486061. The cubic root of 256685471 is about 635.5266435164.

The spelling of 256685471 in words is "two hundred fifty-six million, six hundred eighty-five thousand, four hundred seventy-one".