78699318446880 has 72 divisors (see below), whose sum is σ = 268561424204892. Its totient is φ = 20986484918784.

The previous prime is 78699318446867. The next prime is 78699318446897. The reversal of 78699318446880 is 8864481399687.

78699318446880 is a `hidden beast` number, since 7 + 8 + 6 + 9 + 93 + 1 + 8 + 446 + 8 + 80 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 75754950727824 + 2944367719056 = 8703732^2 + 1715916^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 78699318446880.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 27326150799 + ... + 27326153678.

Almost surely, 2^{78699318446880} is an apocalyptic number.

It is an amenable number.

78699318446880 is an abundant number, since it is smaller than the sum of its proper divisors (189862105758012).

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

78699318446880 is a wasteful number, since it uses less digits than its factorization.

78699318446880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54652304498 (or 54652304487 counting only the distinct ones).

The product of its (nonzero) digits is 4013162496, while the sum is 81.

The spelling of 78699318446880 in words is "seventy-eight trillion, six hundred ninety-nine billion, three hundred eighteen million, four hundred forty-six thousand, eight hundred eighty".