778013867 has 2 divisors, whose sum is σ = 778013868. Its totient is φ = 778013866.

The previous prime is 778013813. The next prime is 778013897. The reversal of 778013867 is 768310877.

It is a strong prime.

It is an emirp because it is prime and its reverse (768310877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 778013867 - 2⁸ = 778013611 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (778013897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389006933 + 389006934.

It is an arithmetic number, because the mean of its divisors is an integer number (389006934).

Almost surely, 2^778013867 is an apocalyptic number.

778013867 is a deficient number, since it is larger than the sum of its proper divisors (1).

778013867 is an equidigital number, since it uses as much as digits as its factorization.

778013867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 395136, while the sum is 47.

The square root of 778013867 is about 27892.8999388733. The cubic root of 778013867 is about 919.7344330370.

The spelling of 778013867 in words is "seven hundred seventy-eight million, thirteen thousand, eight hundred sixty-seven".