869136880 has 80 divisors (see below), whose sum is σ = 2114864640. Its totient is φ = 331553024.

The previous prime is 869136859. The next prime is 869136899. The reversal of 869136880 is 88631968.

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

It is a super-2 number, since 2×869136880² = 1510797832352268800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1035501 + ... + 1036339.

It is an arithmetic number, because the mean of its divisors is an integer number (26435808).

Almost surely, 2^869136880 is an apocalyptic number.

869136880 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 869136880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1057432320).

869136880 is an abundant number, since it is smaller than the sum of its proper divisors (1245727760).

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

869136880 is a wasteful number, since it uses less digits than its factorization.

869136880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438 (or 1432 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 49.

The square root of 869136880 is about 29481.1275225355. The cubic root of 869136880 is about 954.3244695010.

The spelling of 869136880 in words is "eight hundred sixty-nine million, one hundred thirty-six thousand, eight hundred eighty".