78431726868 has 96 divisors (see below), whose sum is σ = 204763991040. Its totient is φ = 23159136000.

The previous prime is 78431726833. The next prime is 78431726897. The reversal of 78431726868 is 86862713487.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4640473 + ... + 4657343.

It is an arithmetic number, because the mean of its divisors is an integer number (2132958240).

Almost surely, 2^78431726868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78431726868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102381995520).

78431726868 is an abundant number, since it is smaller than the sum of its proper divisors (126332264172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78431726868 is a wasteful number, since it uses less digits than its factorization.

78431726868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17789 (or 17787 counting only the distinct ones).

The product of its digits is 21676032, while the sum is 60.

The spelling of 78431726868 in words is "seventy-eight billion, four hundred thirty-one million, seven hundred twenty-six thousand, eight hundred sixty-eight".