78767876565 has 192 divisors, whose sum is σ = 162953856000. Its totient is φ = 35172748800.

The previous prime is 78767876557. The next prime is 78767876581. The reversal of 78767876565 is 56567876787.

78767876565 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 78767876565 - 2³ = 78767876557 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 78767876493 and 78767876502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 253272760 + ... + 253273070.

It is an arithmetic number, because the mean of its divisors is an integer number (848718000).

Almost surely, 2^78767876565 is an apocalyptic number.

It is an amenable number.

78767876565 is an abundant number, since it is smaller than the sum of its proper divisors (84185979435).

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

78767876565 is a wasteful number, since it uses less digits than its factorization.

78767876565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673 (or 656 counting only the distinct ones).

The product of its digits is 829785600, while the sum is 72.

The spelling of 78767876565 in words is "seventy-eight billion, seven hundred sixty-seven million, eight hundred seventy-six thousand, five hundred sixty-five".