78777863 has 4 divisors (see below), whose sum is σ = 79953720. Its totient is φ = 77602008.

The previous prime is 78777859. The next prime is 78777869. The reversal of 78777863 is 36877787.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78777863 - 2² = 78777859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78777869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 587828 + ... + 587961.

It is an arithmetic number, because the mean of its divisors is an integer number (19988430).

Almost surely, 2^78777863 is an apocalyptic number.

78777863 is a deficient number, since it is larger than the sum of its proper divisors (1175857).

78777863 is a wasteful number, since it uses less digits than its factorization.

78777863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175856.

The product of its digits is 2765952, while the sum is 53.

The square root of 78777863 is about 8875.6894380099. The cubic root of 78777863 is about 428.6814902987.

The spelling of 78777863 in words is "seventy-eight million, seven hundred seventy-seven thousand, eight hundred sixty-three".