78564613887 has 24 divisors (see below), whose sum is σ = 114947509248. Its totient is φ = 51704312400.

The previous prime is 78564613819. The next prime is 78564613903. The reversal of 78564613887 is 78831646587.

78564613887 is a `hidden beast` number, since 7 + 8 + 5 + 6 + 4 + 613 + 8 + 8 + 7 = 666.

It is not a de Polignac number, because 78564613887 - 2²⁸ = 78296178431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78564612887) 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, 50748 + ... + 399630.

It is an arithmetic number, because the mean of its divisors is an integer number (4789479552).

Almost surely, 2^78564613887 is an apocalyptic number.

78564613887 is a deficient number, since it is larger than the sum of its proper divisors (36382895361).

78564613887 is a wasteful number, since it uses less digits than its factorization.

78564613887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349211 (or 349208 counting only the distinct ones).

The product of its digits is 54190080, while the sum is 63.

The spelling of 78564613887 in words is "seventy-eight billion, five hundred sixty-four million, six hundred thirteen thousand, eight hundred eighty-seven".