67664939 has 2 divisors, whose sum is σ = 67664940. Its totient is φ = 67664938.

The previous prime is 67664881. The next prime is 67664951. The reversal of 67664939 is 93946676.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67664939 - 2¹⁶ = 67599403 is a prime.

It is not a weakly prime, because it can be changed into another prime (67664999) 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, 33832469 + 33832470.

It is an arithmetic number, because the mean of its divisors is an integer number (33832470).

Almost surely, 2^67664939 is an apocalyptic number.

67664939 is a deficient number, since it is larger than the sum of its proper divisors (1).

67664939 is an equidigital number, since it uses as much as digits as its factorization.

67664939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 50.

The square root of 67664939 is about 8225.8701059523. The cubic root of 67664939 is about 407.4940122321.

The spelling of 67664939 in words is "sixty-seven million, six hundred sixty-four thousand, nine hundred thirty-nine".