78328319 has 2 divisors, whose sum is σ = 78328320. Its totient is φ = 78328318.

The previous prime is 78328303. The next prime is 78328337. The reversal of 78328319 is 91382387.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78328319 - 2⁴ = 78328303 is a prime.

It is a super-2 number, since 2×78328319² = 12270651114731522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is equal to p_4577549 and since 78328319 and 4577549 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78328379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39164159 + 39164160.

It is an arithmetic number, because the mean of its divisors is an integer number (39164160).

Almost surely, 2^78328319 is an apocalyptic number.

78328319 is a deficient number, since it is larger than the sum of its proper divisors (1).

78328319 is an equidigital number, since it uses as much as digits as its factorization.

78328319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 41.

The square root of 78328319 is about 8850.3287509561. The cubic root of 78328319 is about 427.8645140639.

The spelling of 78328319 in words is "seventy-eight million, three hundred twenty-eight thousand, three hundred nineteen".