867878787877 has 4 divisors (see below), whose sum is σ = 867881387500. Its totient is φ = 867876188256.

The previous prime is 867878787869. The next prime is 867878787907. The reversal of 867878787877 is 778787878768.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 835955461636 + 31923326241 = 914306^2 + 178671^2 .

It is a cyclic number.

It is not a de Polignac number, because 867878787877 - 2³ = 867878787869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (867878787827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 709752 + ... + 1496497.

It is an arithmetic number, because the mean of its divisors is an integer number (216970346875).

Almost surely, 2^867878787877 is an apocalyptic number.

It is an amenable number.

867878787877 is a deficient number, since it is larger than the sum of its proper divisors (2599623).

867878787877 is a wasteful number, since it uses less digits than its factorization.

867878787877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2599622.

The product of its digits is 23130734592, while the sum is 88.

The spelling of 867878787877 in words is "eight hundred sixty-seven billion, eight hundred seventy-eight million, seven hundred eighty-seven thousand, eight hundred seventy-seven".