78067399 has 2 divisors, whose sum is σ = 78067400. Its totient is φ = 78067398.

The previous prime is 78067397. The next prime is 78067421. The reversal of 78067399 is 99376087.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78067399 - 2¹ = 78067397 is a prime.

Together with 78067397, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78067397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39033699 + 39033700.

It is an arithmetic number, because the mean of its divisors is an integer number (39033700).

Almost surely, 2^78067399 is an apocalyptic number.

78067399 is a deficient number, since it is larger than the sum of its proper divisors (1).

78067399 is an equidigital number, since it uses as much as digits as its factorization.

78067399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 78067399 is about 8835.5757593945. The cubic root of 78067399 is about 427.3888980918.

The spelling of 78067399 in words is "seventy-eight million, sixty-seven thousand, three hundred ninety-nine".