68045749 has 2 divisors, whose sum is σ = 68045750. Its totient is φ = 68045748.

The previous prime is 68045743. The next prime is 68045759. The reversal of 68045749 is 94754086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62252100 + 5793649 = 7890^2 + 2407^2 .

It is a cyclic number.

It is not a de Polignac number, because 68045749 - 2³ = 68045741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68045741) 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, 34022874 + 34022875.

It is an arithmetic number, because the mean of its divisors is an integer number (34022875).

Almost surely, 2^68045749 is an apocalyptic number.

It is an amenable number.

68045749 is a deficient number, since it is larger than the sum of its proper divisors (1).

68045749 is an equidigital number, since it uses as much as digits as its factorization.

68045749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 68045749 is about 8248.9847254071. The cubic root of 68045749 is about 408.2570247890.

The spelling of 68045749 in words is "sixty-eight million, forty-five thousand, seven hundred forty-nine".