78444319 has 2 divisors, whose sum is σ = 78444320. Its totient is φ = 78444318.

The previous prime is 78444299. The next prime is 78444347. The reversal of 78444319 is 91344487.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78444319 - 2⁵ = 78444287 is a prime.

It is a super-2 number, since 2×78444319² = 12307022366747522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78444389) 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, 39222159 + 39222160.

It is an arithmetic number, because the mean of its divisors is an integer number (39222160).

Almost surely, 2^78444319 is an apocalyptic number.

78444319 is a deficient number, since it is larger than the sum of its proper divisors (1).

78444319 is an equidigital number, since it uses as much as digits as its factorization.

78444319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 40.

The square root of 78444319 is about 8856.8797553089. The cubic root of 78444319 is about 428.0756246111.

The spelling of 78444319 in words is "seventy-eight million, four hundred forty-four thousand, three hundred nineteen".