678444567779 has 24 divisors (see below), whose sum is σ = 789707764944. Its totient is φ = 580404211200.

The previous prime is 678444567763. The next prime is 678444567781. The reversal of 678444567779 is 977765444876.

It is not a de Polignac number, because 678444567779 - 2⁴ = 678444567763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678444567739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17508344 + ... + 17547050.

It is an arithmetic number, because the mean of its divisors is an integer number (32904490206).

Almost surely, 2^678444567779 is an apocalyptic number.

678444567779 is a deficient number, since it is larger than the sum of its proper divisors (111263197165).

678444567779 is a wasteful number, since it uses less digits than its factorization.

678444567779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47267 (or 47256 counting only the distinct ones).

The product of its digits is 1991485440, while the sum is 74.

The spelling of 678444567779 in words is "six hundred seventy-eight billion, four hundred forty-four million, five hundred sixty-seven thousand, seven hundred seventy-nine".