78431372549 has 8 divisors (see below), whose sum is σ = 79584159168. Its totient is φ = 77279922720.

The previous prime is 78431372527. The next prime is 78431372573. The reversal of 78431372549 is 94527313487.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78431372549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78431372549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78431375549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215687 + ... + 450980.

It is an arithmetic number, because the mean of its divisors is an integer number (9948019896).

Almost surely, 2^78431372549 is an apocalyptic number.

It is an amenable number.

78431372549 is a deficient number, since it is larger than the sum of its proper divisors (1152786619).

78431372549 is a wasteful number, since it uses less digits than its factorization.

78431372549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668395.

The product of its digits is 5080320, while the sum is 53.

The spelling of 78431372549 in words is "seventy-eight billion, four hundred thirty-one million, three hundred seventy-two thousand, five hundred forty-nine".