778869345 has 16 divisors (see below), whose sum is σ = 1249896960. Its totient is φ = 414161664.

The previous prime is 778869341. The next prime is 778869359. The reversal of 778869345 is 543968877.

778869345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 778869345 - 2² = 778869341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (778869341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71985 + ... + 82094.

It is an arithmetic number, because the mean of its divisors is an integer number (78118560).

Almost surely, 2^778869345 is an apocalyptic number.

It is an amenable number.

778869345 is a deficient number, since it is larger than the sum of its proper divisors (471027615).

778869345 is a wasteful number, since it uses less digits than its factorization.

778869345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154424.

The product of its digits is 10160640, while the sum is 57.

The square root of 778869345 is about 27908.2307751674. The cubic root of 778869345 is about 920.0714126198.

The spelling of 778869345 in words is "seven hundred seventy-eight million, eight hundred sixty-nine thousand, three hundred forty-five".