78987353863680 has 240 divisors, whose sum is σ = 287953076988720. Its totient is φ = 19954699812864.

The previous prime is 78987353863657. The next prime is 78987353863687. The reversal of 78987353863680 is 8636835378987.

78987353863680 is a `hidden beast` number, since 7 + 8 + 9 + 8 + 73 + 538 + 6 + 3 + 6 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a self number, because there is not a number n which added to its sum of digits gives 78987353863680.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78987353863687) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89779887 + ... + 90655406.

It is an arithmetic number, because the mean of its divisors is an integer number (1199804487453).

Almost surely, 2^{78987353863680} is an apocalyptic number.

It is an amenable number.

78987353863680 is an abundant number, since it is smaller than the sum of its proper divisors (208965723125040).

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

78987353863680 is a wasteful number, since it uses less digits than its factorization.

78987353863680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180435341 (or 180435322 counting only the distinct ones).

The product of its (nonzero) digits is 8778792960, while the sum is 81.

The spelling of 78987353863680 in words is "seventy-eight trillion, nine hundred eighty-seven billion, three hundred fifty-three million, eight hundred sixty-three thousand, six hundred eighty".