68308649 has 2 divisors, whose sum is σ = 68308650. Its totient is φ = 68308648.

The previous prime is 68308621. The next prime is 68308699. The reversal of 68308649 is 94680386.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35188624 + 33120025 = 5932^2 + 5755^2 .

It is a cyclic number.

It is not a de Polignac number, because 68308649 - 2⁸ = 68308393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68308699) 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, 34154324 + 34154325.

It is an arithmetic number, because the mean of its divisors is an integer number (34154325).

Almost surely, 2^68308649 is an apocalyptic number.

It is an amenable number.

68308649 is a deficient number, since it is larger than the sum of its proper divisors (1).

68308649 is an equidigital number, since it uses as much as digits as its factorization.

68308649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 68308649 is about 8264.9046576473. The cubic root of 68308649 is about 408.7821266135.

The spelling of 68308649 in words is "sixty-eight million, three hundred eight thousand, six hundred forty-nine".