878256873 has 24 divisors (see below), whose sum is σ = 1446544008. Its totient is φ = 508672512.

The previous prime is 878256787. The next prime is 878256887. The reversal of 878256873 is 378652878.

878256873 is a `hidden beast` number, since 8 + 7 + 8 + 2 + 568 + 73 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 155077209 + 723179664 = 12453^2 + 26892^2 .

It is not a de Polignac number, because 878256873 - 2¹² = 878252777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (878251873) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 218790 + ... + 222767.

It is an arithmetic number, because the mean of its divisors is an integer number (60272667).

Almost surely, 2^878256873 is an apocalyptic number.

It is an amenable number.

878256873 is a deficient number, since it is larger than the sum of its proper divisors (568287135).

878256873 is a wasteful number, since it uses less digits than its factorization.

878256873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441593 (or 441590 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 54.

The square root of 878256873 is about 29635.3989849977. The cubic root of 878256873 is about 957.6508218631.

The spelling of 878256873 in words is "eight hundred seventy-eight million, two hundred fifty-six thousand, eight hundred seventy-three".