78441809616 has 40 divisors (see below), whose sum is σ = 225157047360. Its totient is φ = 26147269728.

The previous prime is 78441809599. The next prime is 78441809617. The reversal of 78441809616 is 61690814487.

78441809616 is a `hidden beast` number, since 7 + 8 + 4 + 4 + 18 + 0 + 9 + 616 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78441809617) 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 7 ways as a sum of consecutive naturals, for example, 90788700 + ... + 90789563.

It is an arithmetic number, because the mean of its divisors is an integer number (5628926184).

Almost surely, 2^78441809616 is an apocalyptic number.

It is an amenable number.

78441809616 is an abundant number, since it is smaller than the sum of its proper divisors (146715237744).

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

78441809616 is a wasteful number, since it uses less digits than its factorization.

78441809616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181578280 (or 181578268 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 78441809616 in words is "seventy-eight billion, four hundred forty-one million, eight hundred nine thousand, six hundred sixteen".