878817840 has 80 divisors (see below), whose sum is σ = 2731917408. Its totient is φ = 233699328.

The previous prime is 878817829. The next prime is 878817847. The reversal of 878817840 is 48718878.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (878817847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84612 + ... + 94428.

Almost surely, 2^878817840 is an apocalyptic number.

878817840 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 878817840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1365958704).

878817840 is an abundant number, since it is smaller than the sum of its proper divisors (1853099568).

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

878817840 is a wasteful number, since it uses less digits than its factorization.

878817840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10206 (or 10200 counting only the distinct ones).

The product of its (nonzero) digits is 802816, while the sum is 51.

The square root of 878817840 is about 29644.8619494171. The cubic root of 878817840 is about 957.8546711729.

The spelling of 878817840 in words is "eight hundred seventy-eight million, eight hundred seventeen thousand, eight hundred forty".