878744221 has 4 divisors (see below), whose sum is σ = 878915232. Its totient is φ = 878573212.

The previous prime is 878744179. The next prime is 878744231. The reversal of 878744221 is 122447878.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 878744221 - 2²¹ = 876647069 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 (878744231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77551 + ... + 88156.

It is an arithmetic number, because the mean of its divisors is an integer number (219728808).

Almost surely, 2^878744221 is an apocalyptic number.

It is an amenable number.

878744221 is a deficient number, since it is larger than the sum of its proper divisors (171011).

878744221 is a wasteful number, since it uses less digits than its factorization.

878744221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171010.

The product of its digits is 200704, while the sum is 43.

The square root of 878744221 is about 29643.6202411244. The cubic root of 878744221 is about 957.8279237746.

The spelling of 878744221 in words is "eight hundred seventy-eight million, seven hundred forty-four thousand, two hundred twenty-one".