878121878 has 4 divisors (see below), whose sum is σ = 1317182820. Its totient is φ = 439060938.

The previous prime is 878121863. The next prime is 878121883.

878121878 is nontrivially palindromic in base 10.

878121878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219530468 + ... + 219530471.

It is an arithmetic number, because the mean of its divisors is an integer number (329295705).

Almost surely, 2^878121878 is an apocalyptic number.

878121878 is a deficient number, since it is larger than the sum of its proper divisors (439060942).

878121878 is a wasteful number, since it uses less digits than its factorization.

878121878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439060941.

The product of its digits is 401408, while the sum is 50.

The square root of 878121878 is about 29633.1213003288. The cubic root of 878121878 is about 957.6017531905.

The spelling of 878121878 in words is "eight hundred seventy-eight million, one hundred twenty-one thousand, eight hundred seventy-eight".