68144387 has 2 divisors, whose sum is σ = 68144388. Its totient is φ = 68144386.

The previous prime is 68144371. The next prime is 68144389. The reversal of 68144387 is 78344186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68144387 - 2⁴ = 68144371 is a prime.

Together with 68144389, 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 (68144389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34072193 + 34072194.

It is an arithmetic number, because the mean of its divisors is an integer number (34072194).

Almost surely, 2^68144387 is an apocalyptic number.

68144387 is a deficient number, since it is larger than the sum of its proper divisors (1).

68144387 is an equidigital number, since it uses as much as digits as its factorization.

68144387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 41.

The square root of 68144387 is about 8254.9613566630. The cubic root of 68144387 is about 408.4541971061.

The spelling of 68144387 in words is "sixty-eight million, one hundred forty-four thousand, three hundred eighty-seven".