78384311188 has 24 divisors (see below), whose sum is σ = 142821811944. Its totient is φ = 37609420800.

The previous prime is 78384311183. The next prime is 78384311279. The reversal of 78384311188 is 88111348387.

It can be written as a sum of positive squares in 4 ways, for example, as 1382501124 + 77001810064 = 37182^2 + 277492^2 .

It is a super-2 number, since 2×78384311188² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78384311183) 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 in 7 ways as a sum of consecutive naturals, for example, 3907645 + ... + 3927652.

It is an arithmetic number, because the mean of its divisors is an integer number (5950908831).

Almost surely, 2^78384311188 is an apocalyptic number.

It is an amenable number.

78384311188 is a deficient number, since it is larger than the sum of its proper divisors (64437500756).

78384311188 is a wasteful number, since it uses less digits than its factorization.

78384311188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7835403 (or 7835401 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 52.

The spelling of 78384311188 in words is "seventy-eight billion, three hundred eighty-four million, three hundred eleven thousand, one hundred eighty-eight".