22511872 has 36 divisors (see below), whose sum is σ = 45916416. Its totient is φ = 11010560.

The previous prime is 22511861. The next prime is 22511887. The reversal of 22511872 is 27811522.

It is a self number, because there is not a number n which added to its sum of digits gives 22511872.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11097 + ... + 12967.

It is an arithmetic number, because the mean of its divisors is an integer number (1275456).

Almost surely, 2^22511872 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 22511872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22958208).

22511872 is an abundant number, since it is smaller than the sum of its proper divisors (23404544).

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

22511872 is an equidigital number, since it uses as much as digits as its factorization.

22511872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1934 (or 1920 counting only the distinct ones).

The product of its digits is 2240, while the sum is 28.

The square root of 22511872 is about 4744.6677438995. The cubic root of 22511872 is about 282.3604531770.

The spelling of 22511872 in words is "twenty-two million, five hundred eleven thousand, eight hundred seventy-two".