878438889 has 6 divisors (see below), whose sum is σ = 1268856186. Its totient is φ = 585625920.

The previous prime is 878438879. The next prime is 878438893. The reversal of 878438889 is 988834878.

It can be written as a sum of positive squares in only one way, i.e., 544755600 + 333683289 = 23340^2 + 18267^2 .

It is not a de Polignac number, because 878438889 - 2¹¹ = 878436841 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (878438819) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48802152 + ... + 48802169.

It is an arithmetic number, because the mean of its divisors is an integer number (211476031).

Almost surely, 2^878438889 is an apocalyptic number.

It is an amenable number.

878438889 is a deficient number, since it is larger than the sum of its proper divisors (390417297).

878438889 is a wasteful number, since it uses less digits than its factorization.

878438889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97604327 (or 97604324 counting only the distinct ones).

The product of its digits is 24772608, while the sum is 63.

The square root of 878438889 is about 29638.4697479475. The cubic root of 878438889 is about 957.7169740095.

The spelling of 878438889 in words is "eight hundred seventy-eight million, four hundred thirty-eight thousand, eight hundred eighty-nine".