78656047 has 2 divisors, whose sum is σ = 78656048. Its totient is φ = 78656046.

The previous prime is 78656041. The next prime is 78656077. The reversal of 78656047 is 74065687.

It is a weak prime.

It is an emirp because it is prime and its reverse (74065687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78656047 - 2⁷ = 78655919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78655994 and 78656012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78656041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39328023 + 39328024.

It is an arithmetic number, because the mean of its divisors is an integer number (39328024).

Almost surely, 2^78656047 is an apocalyptic number.

78656047 is a deficient number, since it is larger than the sum of its proper divisors (1).

78656047 is an equidigital number, since it uses as much as digits as its factorization.

78656047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 43.

The square root of 78656047 is about 8868.8244429575. The cubic root of 78656047 is about 428.4604163318.

The spelling of 78656047 in words is "seventy-eight million, six hundred fifty-six thousand, forty-seven".