256678907 has 2 divisors, whose sum is σ = 256678908. Its totient is φ = 256678906.

The previous prime is 256678867. The next prime is 256678909. The reversal of 256678907 is 709876652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256678907 - 2⁶ = 256678843 is a prime.

It is a super-2 number, since 2×256678907² = 131768122597429298, which contains 22 as substring.

Together with 256678909, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256678909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128339453 + 128339454.

It is an arithmetic number, because the mean of its divisors is an integer number (128339454).

Almost surely, 2^256678907 is an apocalyptic number.

256678907 is a deficient number, since it is larger than the sum of its proper divisors (1).

256678907 is an equidigital number, since it uses as much as digits as its factorization.

256678907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1270080, while the sum is 50.

The square root of 256678907 is about 16021.2017963697. The cubic root of 256678907 is about 635.5212262088.

The spelling of 256678907 in words is "two hundred fifty-six million, six hundred seventy-eight thousand, nine hundred seven".