78384642188 has 6 divisors (see below), whose sum is σ = 137173123836. Its totient is φ = 39192321092.

The previous prime is 78384642187. The next prime is 78384642221. The reversal of 78384642188 is 88124648387.

It is a super-2 number, since 2×78384642188² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78384642187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9798080270 + ... + 9798080277.

It is an arithmetic number, because the mean of its divisors is an integer number (22862187306).

Almost surely, 2^78384642188 is an apocalyptic number.

It is an amenable number.

78384642188 is a deficient number, since it is larger than the sum of its proper divisors (58788481648).

78384642188 is a wasteful number, since it uses less digits than its factorization.

78384642188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19596160551 (or 19596160549 counting only the distinct ones).

The product of its digits is 16515072, while the sum is 59.

The spelling of 78384642188 in words is "seventy-eight billion, three hundred eighty-four million, six hundred forty-two thousand, one hundred eighty-eight".