68256439 has 2 divisors, whose sum is σ = 68256440. Its totient is φ = 68256438.

The previous prime is 68256337. The next prime is 68256449. The reversal of 68256439 is 93465286.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68256439 - 2¹⁷ = 68125367 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68256395 and 68256404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68256449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34128219 + 34128220.

It is an arithmetic number, because the mean of its divisors is an integer number (34128220).

Almost surely, 2^68256439 is an apocalyptic number.

68256439 is a deficient number, since it is larger than the sum of its proper divisors (1).

68256439 is an equidigital number, since it uses as much as digits as its factorization.

68256439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 43.

The square root of 68256439 is about 8261.7455177462. The cubic root of 68256439 is about 408.6779526180.

It can be divided in two parts, 682 and 56439, that added together give a square (57121 = 239²).

The spelling of 68256439 in words is "sixty-eight million, two hundred fifty-six thousand, four hundred thirty-nine".