67393649 has 2 divisors, whose sum is σ = 67393650. Its totient is φ = 67393648.

The previous prime is 67393639. The next prime is 67393681. The reversal of 67393649 is 94639376.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66994225 + 399424 = 8185^2 + 632^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67393649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (67393609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33696824 + 33696825.

It is an arithmetic number, because the mean of its divisors is an integer number (33696825).

Almost surely, 2^67393649 is an apocalyptic number.

It is an amenable number.

67393649 is a deficient number, since it is larger than the sum of its proper divisors (1).

67393649 is an equidigital number, since it uses as much as digits as its factorization.

67393649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 47.

The square root of 67393649 is about 8209.3634954240. The cubic root of 67393649 is about 406.9486922869.

The spelling of 67393649 in words is "sixty-seven million, three hundred ninety-three thousand, six hundred forty-nine".