878838382985 has 4 divisors (see below), whose sum is σ = 1054606059588. Its totient is φ = 703070706384.

The previous prime is 878838382937. The next prime is 878838382991. The reversal of 878838382985 is 589283838878.

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 469755339769 + 409083043216 = 685387^2 + 639596^2 .

It is a cyclic number.

It is not a de Polignac number, because 878838382985 - 2¹⁶ = 878838317449 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87883838294 + ... + 87883838303.

It is an arithmetic number, because the mean of its divisors is an integer number (263651514897).

Almost surely, 2^878838382985 is an apocalyptic number.

It is an amenable number.

878838382985 is a deficient number, since it is larger than the sum of its proper divisors (175767676603).

878838382985 is a wasteful number, since it uses less digits than its factorization.

878838382985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175767676602.

The product of its digits is 1486356480, while the sum is 77.

The spelling of 878838382985 in words is "eight hundred seventy-eight billion, eight hundred thirty-eight million, three hundred eighty-two thousand, nine hundred eighty-five".