78077863 has 2 divisors, whose sum is σ = 78077864. Its totient is φ = 78077862.

The previous prime is 78077861. The next prime is 78077869. The reversal of 78077863 is 36877087.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78077863 - 2¹ = 78077861 is a prime.

Together with 78077861, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78077861) 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, 39038931 + 39038932.

It is an arithmetic number, because the mean of its divisors is an integer number (39038932).

Almost surely, 2^78077863 is an apocalyptic number.

78077863 is a deficient number, since it is larger than the sum of its proper divisors (1).

78077863 is an equidigital number, since it uses as much as digits as its factorization.

78077863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 395136, while the sum is 46.

The square root of 78077863 is about 8836.1678911166. The cubic root of 78077863 is about 427.4079926933.

The spelling of 78077863 in words is "seventy-eight million, seventy-seven thousand, eight hundred sixty-three".