78536974842 has 40 divisors (see below), whose sum is σ = 179301414996. Its totient is φ = 25685045568.

The previous prime is 78536974819. The next prime is 78536974843. The reversal of 78536974842 is 24847963587.

78536974842 is a `hidden beast` number, since 7 + 8 + 536 + 97 + 4 + 8 + 4 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 70389926721 + 8147048121 = 265311^2 + 90261^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78536974842.

It is not an unprimeable number, because it can be changed into a prime (78536974843) 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 19 ways as a sum of consecutive naturals, for example, 4564963 + ... + 4582134.

Almost surely, 2^78536974842 is an apocalyptic number.

78536974842 is an abundant number, since it is smaller than the sum of its proper divisors (100764440154).

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

78536974842 is a wasteful number, since it uses less digits than its factorization.

78536974842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9147164 (or 9147155 counting only the distinct ones).

The product of its digits is 81285120, while the sum is 63.

The spelling of 78536974842 in words is "seventy-eight billion, five hundred thirty-six million, nine hundred seventy-four thousand, eight hundred forty-two".