778608349 has 2 divisors, whose sum is σ = 778608350. Its totient is φ = 778608348.

The previous prime is 778608289. The next prime is 778608359. The reversal of 778608349 is 943806877.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 650760100 + 127848249 = 25510^2 + 11307^2 .

It is a cyclic number.

It is not a de Polignac number, because 778608349 - 2⁷ = 778608221 is a prime.

It is a super-2 number, since 2×778608349² = 1212461922265011602, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 778608296 and 778608305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778608359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389304174 + 389304175.

It is an arithmetic number, because the mean of its divisors is an integer number (389304175).

Almost surely, 2^778608349 is an apocalyptic number.

It is an amenable number.

778608349 is a deficient number, since it is larger than the sum of its proper divisors (1).

778608349 is an equidigital number, since it uses as much as digits as its factorization.

778608349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 52.

The square root of 778608349 is about 27903.5544151637. The cubic root of 778608349 is about 919.9686303891.

The spelling of 778608349 in words is "seven hundred seventy-eight million, six hundred eight thousand, three hundred forty-nine".