878665213 has 4 divisors (see below), whose sum is σ = 930351420. Its totient is φ = 826979008.

The previous prime is 878665211. The next prime is 878665231. The reversal of 878665213 is 312566878.

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 237714724 + 640950489 = 15418^2 + 25317^2 .

It is not a de Polignac number, because 878665213 - 2¹ = 878665211 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 (878665211) 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, 25843078 + ... + 25843111.

It is an arithmetic number, because the mean of its divisors is an integer number (232587855).

Almost surely, 2^878665213 is an apocalyptic number.

It is an amenable number.

878665213 is a deficient number, since it is larger than the sum of its proper divisors (51686207).

878665213 is a wasteful number, since it uses less digits than its factorization.

878665213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51686206.

The product of its digits is 483840, while the sum is 46.

The square root of 878665213 is about 29642.2875804146. The cubic root of 878665213 is about 957.7992167725.

It can be divided in two parts, 878665 and 213, that added together give a palindrome (878878).

The spelling of 878665213 in words is "eight hundred seventy-eight million, six hundred sixty-five thousand, two hundred thirteen".