78643205444 has 24 divisors (see below), whose sum is σ = 144952516800. Its totient is φ = 37230585120.

The previous prime is 78643205393. The next prime is 78643205479. The reversal of 78643205444 is 44450234687.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164864 + ... + 429495.

It is an arithmetic number, because the mean of its divisors is an integer number (6039688200).

Almost surely, 2^78643205444 is an apocalyptic number.

It is an amenable number.

78643205444 is a deficient number, since it is larger than the sum of its proper divisors (66309311356).

78643205444 is a wasteful number, since it uses less digits than its factorization.

78643205444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596123 (or 596121 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 47.

The spelling of 78643205444 in words is "seventy-eight billion, six hundred forty-three million, two hundred five thousand, four hundred forty-four".