78423498218 has 16 divisors (see below), whose sum is σ = 134136119880. Its totient is φ = 34066315776.

The previous prime is 78423498193. The next prime is 78423498301. The reversal of 78423498218 is 81289432487.

It can be written as a sum of positive squares in 4 ways, for example, as 48306325369 + 30117172849 = 219787^2 + 173543^2 .

It is an unprimeable number.

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, 88713923 + ... + 88714806.

Almost surely, 2^78423498218 is an apocalyptic number.

78423498218 is a deficient number, since it is larger than the sum of its proper divisors (55712621662).

78423498218 is a wasteful number, since it uses less digits than its factorization.

78423498218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177428761.

The product of its digits is 6193152, while the sum is 56.

The spelling of 78423498218 in words is "seventy-eight billion, four hundred twenty-three million, four hundred ninety-eight thousand, two hundred eighteen".