67638379 has 2 divisors, whose sum is σ = 67638380. Its totient is φ = 67638378.

The previous prime is 67638341. The next prime is 67638383. The reversal of 67638379 is 97383676.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67638379 - 2⁷ = 67638251 is a prime.

It is not a weakly prime, because it can be changed into another prime (67638679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33819189 + 33819190.

It is an arithmetic number, because the mean of its divisors is an integer number (33819190).

Almost surely, 2^67638379 is an apocalyptic number.

67638379 is a deficient number, since it is larger than the sum of its proper divisors (1).

67638379 is an equidigital number, since it uses as much as digits as its factorization.

67638379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 49.

The square root of 67638379 is about 8224.2555286178. The cubic root of 67638379 is about 407.4406884206.

The spelling of 67638379 in words is "sixty-seven million, six hundred thirty-eight thousand, three hundred seventy-nine".