256738787 has 2 divisors, whose sum is σ = 256738788. Its totient is φ = 256738786.

The previous prime is 256738763. The next prime is 256738789. The reversal of 256738787 is 787837652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256738787 - 2⁶ = 256738723 is a prime.

Together with 256738789, 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 (256738789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128369393 + 128369394.

It is an arithmetic number, because the mean of its divisors is an integer number (128369394).

Almost surely, 2^256738787 is an apocalyptic number.

256738787 is a deficient number, since it is larger than the sum of its proper divisors (1).

256738787 is an equidigital number, since it uses as much as digits as its factorization.

256738787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3951360, while the sum is 53.

The square root of 256738787 is about 16023.0704610571. The cubic root of 256738787 is about 635.5706421018.

The spelling of 256738787 in words is "two hundred fifty-six million, seven hundred thirty-eight thousand, seven hundred eighty-seven".