78644444443 has 4 divisors (see below), whose sum is σ = 78646445800. Its totient is φ = 78642443088.

The previous prime is 78644444399. The next prime is 78644444449. The reversal of 78644444443 is 34444444687.

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 78644444443 - 2¹³ = 78644436251 is a prime.

It is a super-2 number, since 2×78644444443² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78644444449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 940530 + ... + 1020727.

It is an arithmetic number, because the mean of its divisors is an integer number (19661611450).

Almost surely, 2^78644444443 is an apocalyptic number.

78644444443 is a deficient number, since it is larger than the sum of its proper divisors (2001357).

78644444443 is a wasteful number, since it uses less digits than its factorization.

78644444443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2001356.

The product of its digits is 16515072, while the sum is 52.

The spelling of 78644444443 in words is "seventy-eight billion, six hundred forty-four million, four hundred forty-four thousand, four hundred forty-three".