878222993 has 4 divisors (see below), whose sum is σ = 899643108. Its totient is φ = 856802880.

The previous prime is 878222981. The next prime is 878223061. The reversal of 878222993 is 399222878.

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 192987664 + 685235329 = 13892^2 + 26177^2 .

It is a cyclic number.

It is not a de Polignac number, because 878222993 - 2⁶ = 878222929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (878222953) 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, 10709996 + ... + 10710077.

It is an arithmetic number, because the mean of its divisors is an integer number (224910777).

Almost surely, 2^878222993 is an apocalyptic number.

It is an amenable number.

878222993 is a deficient number, since it is larger than the sum of its proper divisors (21420115).

878222993 is a wasteful number, since it uses less digits than its factorization.

878222993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21420114.

The product of its digits is 870912, while the sum is 50.

The square root of 878222993 is about 29634.8273657870. The cubic root of 878222993 is about 957.6385074601.

The spelling of 878222993 in words is "eight hundred seventy-eight million, two hundred twenty-two thousand, nine hundred ninety-three".