778013849 has 4 divisors (see below), whose sum is σ = 789626064. Its totient is φ = 766401636.

The previous prime is 778013813. The next prime is 778013867. The reversal of 778013849 is 948310877.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-778013849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (778013149) 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 in 3 ways as a sum of consecutive naturals, for example, 5806007 + ... + 5806140.

It is an arithmetic number, because the mean of its divisors is an integer number (197406516).

Almost surely, 2^778013849 is an apocalyptic number.

It is an amenable number.

778013849 is a deficient number, since it is larger than the sum of its proper divisors (11612215).

778013849 is a wasteful number, since it uses less digits than its factorization.

778013849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11612214.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 778013849 is about 27892.8996162106. The cubic root of 778013849 is about 919.7344259440.

The spelling of 778013849 in words is "seven hundred seventy-eight million, thirteen thousand, eight hundred forty-nine".