78543655280 has 80 divisors (see below), whose sum is σ = 187866993600. Its totient is φ = 30525241344.

The previous prime is 78543655261. The next prime is 78543655291. The reversal of 78543655280 is 8255634587.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 346796 + ... + 526644.

It is an arithmetic number, because the mean of its divisors is an integer number (2348337420).

Almost surely, 2^78543655280 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 78543655280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93933496800).

78543655280 is an abundant number, since it is smaller than the sum of its proper divisors (109323338320).

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

78543655280 is a wasteful number, since it uses less digits than its factorization.

78543655280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180018 (or 180012 counting only the distinct ones).

The product of its (nonzero) digits is 8064000, while the sum is 53.

The spelling of 78543655280 in words is "seventy-eight billion, five hundred forty-three million, six hundred fifty-five thousand, two hundred eighty".