78941647 has 2 divisors, whose sum is σ = 78941648. Its totient is φ = 78941646.

The previous prime is 78941633. The next prime is 78941651. The reversal of 78941647 is 74614987.

It is a strong prime.

It is an emirp because it is prime and its reverse (74614987) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78941647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78941597 and 78941606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78941627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39470823 + 39470824.

It is an arithmetic number, because the mean of its divisors is an integer number (39470824).

Almost surely, 2^78941647 is an apocalyptic number.

78941647 is a deficient number, since it is larger than the sum of its proper divisors (1).

78941647 is an equidigital number, since it uses as much as digits as its factorization.

78941647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 46.

The square root of 78941647 is about 8884.9111982056. The cubic root of 78941647 is about 428.9783696710.

It can be divided in two parts, 789 and 41647, that added together give a square (42436 = 206²).

The spelling of 78941647 in words is "seventy-eight million, nine hundred forty-one thousand, six hundred forty-seven".