840878880 has 96 divisors (see below), whose sum is σ = 2705197824. Its totient is φ = 219457536.

The previous prime is 840878861. The next prime is 840878887. The reversal of 840878880 is 88878048.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (840878887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3924 + ... + 41196.

It is an arithmetic number, because the mean of its divisors is an integer number (28179144).

Almost surely, 2^840878880 is an apocalyptic number.

840878880 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840878880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1352598912).

840878880 is an abundant number, since it is smaller than the sum of its proper divisors (1864318944).

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

840878880 is a wasteful number, since it uses less digits than its factorization.

840878880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37338 (or 37330 counting only the distinct ones).

The product of its (nonzero) digits is 917504, while the sum is 51.

The square root of 840878880 is about 28997.9116489447. The cubic root of 840878880 is about 943.8677517505.

The spelling of 840878880 in words is "eight hundred forty million, eight hundred seventy-eight thousand, eight hundred eighty".