78564718620 has 36 divisors (see below), whose sum is σ = 238312980360. Its totient is φ = 20950591584.

The previous prime is 78564718571. The next prime is 78564718637. The reversal of 78564718620 is 2681746587.

78564718620 is a `hidden beast` number, since 7 + 8 + 5 + 6 + 4 + 7 + 1 + 8 + 620 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 218235150 + ... + 218235509.

It is an arithmetic number, because the mean of its divisors is an integer number (6619805010).

Almost surely, 2^78564718620 is an apocalyptic number.

It is an amenable number.

78564718620 is an abundant number, since it is smaller than the sum of its proper divisors (159748261740).

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

78564718620 is a wasteful number, since it uses less digits than its factorization.

78564718620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436470674 (or 436470669 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The spelling of 78564718620 in words is "seventy-eight billion, five hundred sixty-four million, seven hundred eighteen thousand, six hundred twenty".