78474844784 has 80 divisors (see below), whose sum is σ = 176919676416. Its totient is φ = 33025440000.

The previous prime is 78474844757. The next prime is 78474844801. The reversal of 78474844784 is 48744847487.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 78474844784.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1976294 + ... + 2015610.

Almost surely, 2^78474844784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78474844784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88459838208).

78474844784 is an abundant number, since it is smaller than the sum of its proper divisors (98444831632).

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

78474844784 is a wasteful number, since it uses less digits than its factorization.

78474844784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39654 (or 39648 counting only the distinct ones).

The product of its digits is 179830784, while the sum is 65.

The spelling of 78474844784 in words is "seventy-eight billion, four hundred seventy-four million, eight hundred forty-four thousand, seven hundred eighty-four".