869978840 has 64 divisors (see below), whose sum is σ = 2064808800. Its totient is φ = 328983552.

The previous prime is 869978839. The next prime is 869978849. The reversal of 869978840 is 48879968.

It is a self number, because there is not a number n which added to its sum of digits gives 869978840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869978849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 495404 + ... + 497156.

Almost surely, 2^869978840 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 869978840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1032404400).

869978840 is an abundant number, since it is smaller than the sum of its proper divisors (1194829960).

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

869978840 is a wasteful number, since it uses less digits than its factorization.

869978840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2436 (or 2432 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 59.

The square root of 869978840 is about 29495.4037097308. The cubic root of 869978840 is about 954.6325313376.

The spelling of 869978840 in words is "eight hundred sixty-nine million, nine hundred seventy-eight thousand, eight hundred forty".