78719213 has 2 divisors, whose sum is σ = 78719214. Its totient is φ = 78719212.

The previous prime is 78719209. The next prime is 78719227. The reversal of 78719213 is 31291787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67683529 + 11035684 = 8227^2 + 3322^2 .

It is a cyclic number.

It is not a de Polignac number, because 78719213 - 2² = 78719209 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78719203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39359606 + 39359607.

It is an arithmetic number, because the mean of its divisors is an integer number (39359607).

Almost surely, 2^78719213 is an apocalyptic number.

It is an amenable number.

78719213 is a deficient number, since it is larger than the sum of its proper divisors (1).

78719213 is an equidigital number, since it uses as much as digits as its factorization.

78719213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 38.

The square root of 78719213 is about 8872.3848541415. The cubic root of 78719213 is about 428.5750796461.

The spelling of 78719213 in words is "seventy-eight million, seven hundred nineteen thousand, two hundred thirteen".