78822647 has 2 divisors, whose sum is σ = 78822648. Its totient is φ = 78822646.

The previous prime is 78822631. The next prime is 78822661. The reversal of 78822647 is 74622887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78822647 - 2⁴ = 78822631 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78822598 and 78822607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78821647) 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, 39411323 + 39411324.

It is an arithmetic number, because the mean of its divisors is an integer number (39411324).

Almost surely, 2^78822647 is an apocalyptic number.

78822647 is a deficient number, since it is larger than the sum of its proper divisors (1).

78822647 is an equidigital number, since it uses as much as digits as its factorization.

78822647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 301056, while the sum is 44.

The square root of 78822647 is about 8878.2119258328. The cubic root of 78822647 is about 428.7627078487.

The spelling of 78822647 in words is "seventy-eight million, eight hundred twenty-two thousand, six hundred forty-seven".