878821650 has 144 divisors (see below), whose sum is σ = 2798612544. Its totient is φ = 200854080.

The previous prime is 878821639. The next prime is 878821663. The reversal of 878821650 is 56128878.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 878821596 and 878821605.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 79884 + ... + 90216.

Almost surely, 2^878821650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 878821650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1399306272).

878821650 is an abundant number, since it is smaller than the sum of its proper divisors (1919790894).

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

878821650 is a wasteful number, since it uses less digits than its factorization.

878821650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10367 (or 10350 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The square root of 878821650 is about 29644.9262100616. The cubic root of 878821650 is about 957.8560553888.

The spelling of 878821650 in words is "eight hundred seventy-eight million, eight hundred twenty-one thousand, six hundred fifty".