778795049 has 2 divisors, whose sum is σ = 778795050. Its totient is φ = 778795048.

The previous prime is 778795021. The next prime is 778795117. The reversal of 778795049 is 940597877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 681575449 + 97219600 = 26107^2 + 9860^2 .

It is a cyclic number.

It is not a de Polignac number, because 778795049 - 2¹² = 778790953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 778794985 and 778795003.

It is not a weakly prime, because it can be changed into another prime (778795949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389397524 + 389397525.

It is an arithmetic number, because the mean of its divisors is an integer number (389397525).

Almost surely, 2^778795049 is an apocalyptic number.

It is an amenable number.

778795049 is a deficient number, since it is larger than the sum of its proper divisors (1).

778795049 is an equidigital number, since it uses as much as digits as its factorization.

778795049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4445280, while the sum is 56.

The square root of 778795049 is about 27906.8996665699. The cubic root of 778795049 is about 920.0421566221.

It can be divided in two parts, 77879 and 5049, that added together give a palindrome (82928).

The spelling of 778795049 in words is "seven hundred seventy-eight million, seven hundred ninety-five thousand, forty-nine".