11289987872 has 48 divisors (see below), whose sum is σ = 23460212160. Its totient is φ = 5333444352.

The previous prime is 11289987871. The next prime is 11289987887. The reversal of 11289987872 is 27878998211.

It is a super-2 number, since 2×11289987872² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11289987871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201893 + ... + 251675.

It is an arithmetic number, because the mean of its divisors is an integer number (488754420).

Almost surely, 2^11289987872 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 11289987872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11730106080).

11289987872 is an abundant number, since it is smaller than the sum of its proper divisors (12170224288).

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

11289987872 is a wasteful number, since it uses less digits than its factorization.

11289987872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50185 (or 50177 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 62.

The spelling of 11289987872 in words is "eleven billion, two hundred eighty-nine million, nine hundred eighty-seven thousand, eight hundred seventy-two".