256740767 has 2 divisors, whose sum is σ = 256740768. Its totient is φ = 256740766.

The previous prime is 256740739. The next prime is 256740769. The reversal of 256740767 is 767047652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256740767 - 2¹⁴ = 256724383 is a prime.

Together with 256740769, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256740769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128370383 + 128370384.

It is an arithmetic number, because the mean of its divisors is an integer number (128370384).

Almost surely, 2^256740767 is an apocalyptic number.

256740767 is a deficient number, since it is larger than the sum of its proper divisors (1).

256740767 is an equidigital number, since it uses as much as digits as its factorization.

256740767 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 493920, while the sum is 44.

The square root of 256740767 is about 16023.1322468486. The cubic root of 256740767 is about 635.5722759630.

It can be divided in two parts, 2567 and 40767, that added together give a palindrome (43334).

The spelling of 256740767 in words is "two hundred fifty-six million, seven hundred forty thousand, seven hundred sixty-seven".