78443784836 has 12 divisors (see below), whose sum is σ = 139866748812. Its totient is φ = 38481856608.

The previous prime is 78443784823. The next prime is 78443784893. The reversal of 78443784836 is 63848734487.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 42191624836 + 36252160000 = 205406^2 + 190400^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185008715 + ... + 185009138.

It is an arithmetic number, because the mean of its divisors is an integer number (11655562401).

Almost surely, 2^78443784836 is an apocalyptic number.

It is an amenable number.

78443784836 is a deficient number, since it is larger than the sum of its proper divisors (61422963976).

78443784836 is a wasteful number, since it uses less digits than its factorization.

78443784836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370017910 (or 370017908 counting only the distinct ones).

The product of its digits is 86704128, while the sum is 62.

The spelling of 78443784836 in words is "seventy-eight billion, four hundred forty-three million, seven hundred eighty-four thousand, eight hundred thirty-six".