68138207 has 2 divisors, whose sum is σ = 68138208. Its totient is φ = 68138206.

The previous prime is 68138143. The next prime is 68138219. The reversal of 68138207 is 70283186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68138207 - 2⁶ = 68138143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68138107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34069103 + 34069104.

It is an arithmetic number, because the mean of its divisors is an integer number (34069104).

Almost surely, 2^68138207 is an apocalyptic number.

68138207 is a deficient number, since it is larger than the sum of its proper divisors (1).

68138207 is an equidigital number, since it uses as much as digits as its factorization.

68138207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 68138207 is about 8254.5870278288. The cubic root of 68138207 is about 408.4418491913.

The spelling of 68138207 in words is "sixty-eight million, one hundred thirty-eight thousand, two hundred seven".