778278223 has 2 divisors, whose sum is σ = 778278224. Its totient is φ = 778278222.

The previous prime is 778278167. The next prime is 778278229. The reversal of 778278223 is 322872877.

It is a strong prime.

It is an emirp because it is prime and its reverse (322872877) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-778278223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778278229) 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, 389139111 + 389139112.

It is an arithmetic number, because the mean of its divisors is an integer number (389139112).

Almost surely, 2^778278223 is an apocalyptic number.

778278223 is a deficient number, since it is larger than the sum of its proper divisors (1).

778278223 is an equidigital number, since it uses as much as digits as its factorization.

778278223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 526848, while the sum is 46.

The square root of 778278223 is about 27897.6383050609. The cubic root of 778278223 is about 919.8385913274.

The spelling of 778278223 in words is "seven hundred seventy-eight million, two hundred seventy-eight thousand, two hundred twenty-three".