778494494878 has 8 divisors (see below), whose sum is σ = 1168359927840. Its totient is φ = 389041185600.

The previous prime is 778494494863. The next prime is 778494494881. The reversal of 778494494878 is 878494494877.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 778494494798 and 778494494807.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 103026198 + ... + 103033753.

It is an arithmetic number, because the mean of its divisors is an integer number (146044990980).

Almost surely, 2^778494494878 is an apocalyptic number.

778494494878 is a deficient number, since it is larger than the sum of its proper divisors (389865432962).

778494494878 is a wasteful number, since it uses less digits than its factorization.

778494494878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206061842.

The product of its digits is 3641573376, while the sum is 79.

Subtracting 778494494878 from its reverse (878494494877), we obtain a palindrome (99999999999).

The spelling of 778494494878 in words is "seven hundred seventy-eight billion, four hundred ninety-four million, four hundred ninety-four thousand, eight hundred seventy-eight".