67643393 has 2 divisors, whose sum is σ = 67643394. Its totient is φ = 67643392.

The previous prime is 67643383. The next prime is 67643413. The reversal of 67643393 is 39334676.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51739249 + 15904144 = 7193^2 + 3988^2 .

It is a cyclic number.

It is not a de Polignac number, because 67643393 - 2¹⁰ = 67642369 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 67643393.

It is not a weakly prime, because it can be changed into another prime (67643383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33821696 + 33821697.

It is an arithmetic number, because the mean of its divisors is an integer number (33821697).

Almost surely, 2^67643393 is an apocalyptic number.

It is an amenable number.

67643393 is a deficient number, since it is larger than the sum of its proper divisors (1).

67643393 is an equidigital number, since it uses as much as digits as its factorization.

67643393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 41.

The square root of 67643393 is about 8224.5603529915. The cubic root of 67643393 is about 407.4507559649.

The spelling of 67643393 in words is "sixty-seven million, six hundred forty-three thousand, three hundred ninety-three".