78444665568840 has 64 divisors (see below), whose sum is σ = 235347411605760. Its totient is φ = 20917385049600.

The previous prime is 78444665568827. The next prime is 78444665568847. The reversal of 78444665568840 is 4886556644487.

It is not an unprimeable number, because it can be changed into a prime (78444665568847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16516909 + ... + 20729148.

It is an arithmetic number, because the mean of its divisors is an integer number (3677303306340).

Almost surely, 2^{78444665568840} is an apocalyptic number.

It is an amenable number.

78444665568840 is an abundant number, since it is smaller than the sum of its proper divisors (156902746036920).

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

78444665568840 is a wasteful number, since it uses less digits than its factorization.

78444665568840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37263622 (or 37263618 counting only the distinct ones).

The product of its (nonzero) digits is 4954521600, while the sum is 75.

The spelling of 78444665568840 in words is "seventy-eight trillion, four hundred forty-four billion, six hundred sixty-five million, five hundred sixty-eight thousand, eight hundred forty".