778312823 has 2 divisors, whose sum is σ = 778312824. Its totient is φ = 778312822.

The previous prime is 778312811. The next prime is 778312841. The reversal of 778312823 is 328213877.

It is a weak prime.

It is an emirp because it is prime and its reverse (328213877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 778312823 - 2¹⁴ = 778296439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778312883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389156411 + 389156412.

It is an arithmetic number, because the mean of its divisors is an integer number (389156412).

Almost surely, 2^778312823 is an apocalyptic number.

778312823 is a deficient number, since it is larger than the sum of its proper divisors (1).

778312823 is an equidigital number, since it uses as much as digits as its factorization.

778312823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 41.

The square root of 778312823 is about 27898.2584223460. The cubic root of 778312823 is about 919.8522222470.

The spelling of 778312823 in words is "seven hundred seventy-eight million, three hundred twelve thousand, eight hundred twenty-three".