778022879 has 2 divisors, whose sum is σ = 778022880. Its totient is φ = 778022878.

The previous prime is 778022873. The next prime is 778022923. The reversal of 778022879 is 978220877.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 778022879 - 2²⁸ = 509587423 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778022873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389011439 + 389011440.

It is an arithmetic number, because the mean of its divisors is an integer number (389011440).

Almost surely, 2^778022879 is an apocalyptic number.

778022879 is a deficient number, since it is larger than the sum of its proper divisors (1).

778022879 is an equidigital number, since it uses as much as digits as its factorization.

778022879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 790272, while the sum is 50.

The square root of 778022879 is about 27893.0614848926. The cubic root of 778022879 is about 919.7379842225.

The spelling of 778022879 in words is "seven hundred seventy-eight million, twenty-two thousand, eight hundred seventy-nine".