778561323 has 8 divisors (see below), whose sum is σ = 1038216336. Its totient is φ = 518973600.

The previous prime is 778561321. The next prime is 778561349. The reversal of 778561323 is 323165877.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 778561323 - 2¹ = 778561321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (778561321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25113 + ... + 46773.

It is an arithmetic number, because the mean of its divisors is an integer number (129777042).

Almost surely, 2^778561323 is an apocalyptic number.

778561323 is a deficient number, since it is larger than the sum of its proper divisors (259655013).

778561323 is a wasteful number, since it uses less digits than its factorization.

778561323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33645.

The product of its digits is 211680, while the sum is 42.

The square root of 778561323 is about 27902.7117499357. The cubic root of 778561323 is about 919.9501087469.

The spelling of 778561323 in words is "seven hundred seventy-eight million, five hundred sixty-one thousand, three hundred twenty-three".