67768321 has 2 divisors, whose sum is σ = 67768322. Its totient is φ = 67768320.

The previous prime is 67768303. The next prime is 67768357. The reversal of 67768321 is 12386776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66601921 + 1166400 = 8161^2 + 1080^2 .

It is a cyclic number.

It is not a de Polignac number, because 67768321 - 2²¹ = 65671169 is a prime.

It is not a weakly prime, because it can be changed into another prime (67768361) 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, 33884160 + 33884161.

It is an arithmetic number, because the mean of its divisors is an integer number (33884161).

Almost surely, 2^67768321 is an apocalyptic number.

It is an amenable number.

67768321 is a deficient number, since it is larger than the sum of its proper divisors (1).

67768321 is an equidigital number, since it uses as much as digits as its factorization.

67768321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 40.

The square root of 67768321 is about 8232.1516628400. The cubic root of 67768321 is about 407.7014367857.

The spelling of 67768321 in words is "sixty-seven million, seven hundred sixty-eight thousand, three hundred twenty-one".