78644286443 has 4 divisors (see below), whose sum is σ = 78855129408. Its totient is φ = 78433443480.

The previous prime is 78644286437. The next prime is 78644286467. The reversal of 78644286443 is 34468244687.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78644286443 - 2⁶ = 78644286379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78644289443) by changing a digit.

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, 105420923 + ... + 105421668.

It is an arithmetic number, because the mean of its divisors is an integer number (19713782352).

Almost surely, 2^78644286443 is an apocalyptic number.

78644286443 is a deficient number, since it is larger than the sum of its proper divisors (210842965).

78644286443 is a wasteful number, since it uses less digits than its factorization.

78644286443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210842964.

The product of its digits is 24772608, while the sum is 56.

The spelling of 78644286443 in words is "seventy-eight billion, six hundred forty-four million, two hundred eighty-six thousand, four hundred forty-three".