78643729443 has 16 divisors (see below), whose sum is σ = 105076540800. Its totient is φ = 52320105216.

The previous prime is 78643729387. The next prime is 78643729447. The reversal of 78643729443 is 34492734687.

It is not a de Polignac number, because 78643729443 - 2⁹ = 78643728931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78643729447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5802771 + ... + 5816307.

It is an arithmetic number, because the mean of its divisors is an integer number (6567283800).

Almost surely, 2^78643729443 is an apocalyptic number.

78643729443 is a deficient number, since it is larger than the sum of its proper divisors (26432811357).

78643729443 is a wasteful number, since it uses less digits than its factorization.

78643729443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17426.

The product of its digits is 24385536, while the sum is 57.

The spelling of 78643729443 in words is "seventy-eight billion, six hundred forty-three million, seven hundred twenty-nine thousand, four hundred forty-three".