878787878769 has 12 divisors (see below), whose sum is σ = 1293310463796. Its totient is φ = 574804649952.

The previous prime is 878787878767. The next prime is 878787878797. The reversal of 878787878769 is 967878787878.

It can be written as a sum of positive squares in 2 ways, for example, as 588999456369 + 289788422400 = 767463^2 + 538320^2 .

It is not a de Polignac number, because 878787878769 - 2¹ = 878787878767 is a prime.

It is a super-2 number, since 2×878787878769² (a number of 25 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (878787878767) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 921160822 + ... + 921161775.

It is an arithmetic number, because the mean of its divisors is an integer number (107775871983).

Almost surely, 2^878787878769 is an apocalyptic number.

It is an amenable number.

878787878769 is a deficient number, since it is larger than the sum of its proper divisors (414522585027).

878787878769 is a wasteful number, since it uses less digits than its factorization.

878787878769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1842322656 (or 1842322653 counting only the distinct ones).

The product of its digits is 29739515904, while the sum is 90.

The spelling of 878787878769 in words is "eight hundred seventy-eight billion, seven hundred eighty-seven million, eight hundred seventy-eight thousand, seven hundred sixty-nine".