78834863 has 2 divisors, whose sum is σ = 78834864. Its totient is φ = 78834862.

The previous prime is 78834859. The next prime is 78834871. The reversal of 78834863 is 36843887.

It is a weak prime.

It is an emirp because it is prime and its reverse (36843887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78834863 - 2² = 78834859 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78834893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39417431 + 39417432.

It is an arithmetic number, because the mean of its divisors is an integer number (39417432).

Almost surely, 2^78834863 is an apocalyptic number.

78834863 is a deficient number, since it is larger than the sum of its proper divisors (1).

78834863 is an equidigital number, since it uses as much as digits as its factorization.

78834863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 774144, while the sum is 47.

The square root of 78834863 is about 8878.8998755476. The cubic root of 78834863 is about 428.7848567059.

It can be divided in two parts, 78834 and 863, that added together give a palindrome (79697).

The spelling of 78834863 in words is "seventy-eight million, eight hundred thirty-four thousand, eight hundred sixty-three".