878972789 has 4 divisors (see below), whose sum is σ = 879752460. Its totient is φ = 878193120.

The previous prime is 878972747. The next prime is 878972797. The reversal of 878972789 is 987279878.

878972789 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 can be written as a sum of positive squares in 2 ways, for example, as 314530225 + 564442564 = 17735^2 + 23758^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-878972789 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 (878972089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388142 + ... + 390399.

It is an arithmetic number, because the mean of its divisors is an integer number (219938115).

Almost surely, 2^878972789 is an apocalyptic number.

It is an amenable number.

878972789 is a deficient number, since it is larger than the sum of its proper divisors (779671).

878972789 is a wasteful number, since it uses less digits than its factorization.

878972789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779670.

The product of its digits is 28449792, while the sum is 65.

The square root of 878972789 is about 29647.4752550702. The cubic root of 878972789 is about 957.9109626646.

The spelling of 878972789 in words is "eight hundred seventy-eight million, nine hundred seventy-two thousand, seven hundred eighty-nine".