256484717 has 8 divisors (see below), whose sum is σ = 257990520. Its totient is φ = 254983680.

The previous prime is 256484693. The next prime is 256484719. The reversal of 256484717 is 717484652.

It can be written as a sum of positive squares in 4 ways, for example, as 292681 + 256192036 = 541^2 + 16006^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256484717 - 2⁸ = 256484461 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 (256484719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171509 + ... + 172997.

It is an arithmetic number, because the mean of its divisors is an integer number (32248815).

Almost surely, 2^256484717 is an apocalyptic number.

It is an amenable number.

256484717 is a deficient number, since it is larger than the sum of its proper divisors (1505803).

256484717 is a wasteful number, since it uses less digits than its factorization.

256484717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2383.

The product of its digits is 376320, while the sum is 44.

The square root of 256484717 is about 16015.1402429076. The cubic root of 256484717 is about 635.3609182664.

The spelling of 256484717 in words is "two hundred fifty-six million, four hundred eighty-four thousand, seven hundred seventeen".