78855863 has 2 divisors, whose sum is σ = 78855864. Its totient is φ = 78855862.

The previous prime is 78855857. The next prime is 78855883. The reversal of 78855863 is 36855887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78855863 - 2⁸ = 78855607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78855883) 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, 39427931 + 39427932.

It is an arithmetic number, because the mean of its divisors is an integer number (39427932).

Almost surely, 2^78855863 is an apocalyptic number.

78855863 is a deficient number, since it is larger than the sum of its proper divisors (1).

78855863 is an equidigital number, since it uses as much as digits as its factorization.

78855863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1612800, while the sum is 50.

The square root of 78855863 is about 8880.0823757440. The cubic root of 78855863 is about 428.8229265067.

The spelling of 78855863 in words is "seventy-eight million, eight hundred fifty-five thousand, eight hundred sixty-three".