778823047 has 2 divisors, whose sum is σ = 778823048. Its totient is φ = 778823046.

The previous prime is 778823039. The next prime is 778823063. The reversal of 778823047 is 740328877.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 778823047 - 2³ = 778823039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 778822988 and 778823006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778823347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389411523 + 389411524.

It is an arithmetic number, because the mean of its divisors is an integer number (389411524).

Almost surely, 2^778823047 is an apocalyptic number.

778823047 is a deficient number, since it is larger than the sum of its proper divisors (1).

778823047 is an equidigital number, since it uses as much as digits as its factorization.

778823047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 526848, while the sum is 46.

The square root of 778823047 is about 27907.4012942803. The cubic root of 778823047 is about 920.0531817871.

The spelling of 778823047 in words is "seven hundred seventy-eight million, eight hundred twenty-three thousand, forty-seven".