78344245643 has 8 divisors (see below), whose sum is σ = 80204819376. Its totient is φ = 76485427200.

The previous prime is 78344245597. The next prime is 78344245657. The reversal of 78344245643 is 34654244387.

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

It is a cyclic number.

It is not a de Polignac number, because 78344245643 - 2¹⁸ = 78343983499 is a prime.

It is a super-2 number, since 2×78344245643² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78344245591 and 78344245600.

It is not an unprimeable number, because it can be changed into a prime (78344242643) 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 7 ways as a sum of consecutive naturals, for example, 348278 + ... + 527243.

It is an arithmetic number, because the mean of its divisors is an integer number (10025602422).

Almost surely, 2^78344245643 is an apocalyptic number.

78344245643 is a deficient number, since it is larger than the sum of its proper divisors (1860573733).

78344245643 is a wasteful number, since it uses less digits than its factorization.

78344245643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877645.

The product of its digits is 7741440, while the sum is 50.

The spelling of 78344245643 in words is "seventy-eight billion, three hundred forty-four million, two hundred forty-five thousand, six hundred forty-three".