78643636378 has 8 divisors (see below), whose sum is σ = 117966648672. Its totient is φ = 39321420156.

The previous prime is 78643636367. The next prime is 78643636381. The reversal of 78643636378 is 87363634687.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256251 + ... + 472177.

It is an arithmetic number, because the mean of its divisors is an integer number (14745831084).

Almost surely, 2^78643636378 is an apocalyptic number.

78643636378 is a deficient number, since it is larger than the sum of its proper divisors (39323012294).

78643636378 is a wasteful number, since it uses less digits than its factorization.

78643636378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398036.

The product of its digits is 73156608, while the sum is 61.

The spelling of 78643636378 in words is "seventy-eight billion, six hundred forty-three million, six hundred thirty-six thousand, three hundred seventy-eight".