778408249 has 2 divisors, whose sum is σ = 778408250. Its totient is φ = 778408248.

The previous prime is 778408237. The next prime is 778408303. The reversal of 778408249 is 942804877.

778408249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 699073600 + 79334649 = 26440^2 + 8907^2 .

It is a cyclic number.

It is not a de Polignac number, because 778408249 - 2⁵ = 778408217 is a prime.

It is a super-2 number, since 2×778408249² = 1211838804222492002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (778408229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389204124 + 389204125.

It is an arithmetic number, because the mean of its divisors is an integer number (389204125).

Almost surely, 2^778408249 is an apocalyptic number.

It is an amenable number.

778408249 is a deficient number, since it is larger than the sum of its proper divisors (1).

778408249 is an equidigital number, since it uses as much as digits as its factorization.

778408249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 903168, while the sum is 49.

The square root of 778408249 is about 27899.9686200540. The cubic root of 778408249 is about 919.8898139147.

The spelling of 778408249 in words is "seven hundred seventy-eight million, four hundred eight thousand, two hundred forty-nine".