878649856 has 80 divisors (see below), whose sum is σ = 2039780160. Its totient is φ = 370298880.

The previous prime is 878649809. The next prime is 878649857. The reversal of 878649856 is 658946878.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a junction number, because it is equal to n+sod(n) for n = 878649794 and 878649803.

It is not an unprimeable number, because it can be changed into a prime (878649857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216615 + ... + 220633.

It is an arithmetic number, because the mean of its divisors is an integer number (25497252).

Almost surely, 2^878649856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 878649856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1019890080).

878649856 is an abundant number, since it is smaller than the sum of its proper divisors (1161130304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

878649856 is an equidigital number, since it uses as much as digits as its factorization.

878649856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4105 (or 4089 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 61.

The square root of 878649856 is about 29642.0285405706. The cubic root of 878649856 is about 957.7936367146.

The spelling of 878649856 in words is "eight hundred seventy-eight million, six hundred forty-nine thousand, eight hundred fifty-six".