78885647 has 2 divisors, whose sum is σ = 78885648. Its totient is φ = 78885646.

The previous prime is 78885637. The next prime is 78885649. The reversal of 78885647 is 74658887.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (74658887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78885647 - 2¹⁶ = 78820111 is a prime.

Together with 78885649, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78885649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39442823 + 39442824.

It is an arithmetic number, because the mean of its divisors is an integer number (39442824).

Almost surely, 2^78885647 is an apocalyptic number.

78885647 is the 4748-th centered heptagonal number.

78885647 is a deficient number, since it is larger than the sum of its proper divisors (1).

78885647 is an equidigital number, since it uses as much as digits as its factorization.

78885647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3010560, while the sum is 53.

The square root of 78885647 is about 8881.7592288915. The cubic root of 78885647 is about 428.8769087720.

The spelling of 78885647 in words is "seventy-eight million, eight hundred eighty-five thousand, six hundred forty-seven".