68427857 has 2 divisors, whose sum is σ = 68427858. Its totient is φ = 68427856.

The previous prime is 68427841. The next prime is 68427859. The reversal of 68427857 is 75872486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62663056 + 5764801 = 7916^2 + 2401^2 .

It is a cyclic number.

It is not a de Polignac number, because 68427857 - 2⁴ = 68427841 is a prime.

It is a super-2 number, since 2×68427857² = 9364743227224898, which contains 22 as substring.

Together with 68427859, 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 (68427859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34213928 + 34213929.

It is an arithmetic number, because the mean of its divisors is an integer number (34213929).

Almost surely, 2^68427857 is an apocalyptic number.

It is an amenable number.

68427857 is a deficient number, since it is larger than the sum of its proper divisors (1).

68427857 is an equidigital number, since it uses as much as digits as its factorization.

68427857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 752640, while the sum is 47.

The square root of 68427857 is about 8272.1132124748. The cubic root of 68427857 is about 409.0197821228.

The spelling of 68427857 in words is "sixty-eight million, four hundred twenty-seven thousand, eight hundred fifty-seven".