68626639 has 2 divisors, whose sum is σ = 68626640. Its totient is φ = 68626638.

The previous prime is 68626583. The next prime is 68626669. The reversal of 68626639 is 93662686.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68626639 - 2⁷ = 68626511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68626669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34313319 + 34313320.

It is an arithmetic number, because the mean of its divisors is an integer number (34313320).

Almost surely, 2^68626639 is an apocalyptic number.

68626639 is a deficient number, since it is larger than the sum of its proper divisors (1).

68626639 is an equidigital number, since it uses as much as digits as its factorization.

68626639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 46.

The square root of 68626639 is about 8284.1196876916. The cubic root of 68626639 is about 409.4154648656.

The spelling of 68626639 in words is "sixty-eight million, six hundred twenty-six thousand, six hundred thirty-nine".