878121879 has 16 divisors (see below), whose sum is σ = 1236681600. Its totient is φ = 552699936.

The previous prime is 878121863. The next prime is 878121883. The reversal of 878121879 is 978121878.

It is not a de Polignac number, because 878121879 - 2⁴ = 878121863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878121809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9589 + ... + 42990.

It is an arithmetic number, because the mean of its divisors is an integer number (77292600).

Almost surely, 2^878121879 is an apocalyptic number.

878121879 is a deficient number, since it is larger than the sum of its proper divisors (358559721).

878121879 is a wasteful number, since it uses less digits than its factorization.

878121879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52894.

The product of its digits is 451584, while the sum is 51.

The square root of 878121879 is about 29633.1213172018. The cubic root of 878121879 is about 957.6017535540.

Subtracting 878121879 from its reverse (978121878), we obtain a palindrome (99999999).

The spelling of 878121879 in words is "eight hundred seventy-eight million, one hundred twenty-one thousand, eight hundred seventy-nine".