256367647 has 2 divisors, whose sum is σ = 256367648. Its totient is φ = 256367646.

The previous prime is 256367623. The next prime is 256367651. The reversal of 256367647 is 746763652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256367647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256367597 and 256367606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256367747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128183823 + 128183824.

It is an arithmetic number, because the mean of its divisors is an integer number (128183824).

Almost surely, 2^256367647 is an apocalyptic number.

256367647 is a deficient number, since it is larger than the sum of its proper divisors (1).

256367647 is an equidigital number, since it uses as much as digits as its factorization.

256367647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 46.

The square root of 256367647 is about 16011.4848468217. The cubic root of 256367647 is about 635.2642354135.

The spelling of 256367647 in words is "two hundred fifty-six million, three hundred sixty-seven thousand, six hundred forty-seven".