22115872 has 12 divisors (see below), whose sum is σ = 43540686. Its totient is φ = 11057920.

The previous prime is 22115839. The next prime is 22115887. The reversal of 22115872 is 27851122.

It can be written as a sum of positive squares in only one way, i.e., 15335056 + 6780816 = 3916^2 + 2604^2 .

It is a super-2 number, since 2×22115872² = 978223588640768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22115872.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345529 + ... + 345592.

Almost surely, 2^22115872 is an apocalyptic number.

It is an amenable number.

22115872 is a deficient number, since it is larger than the sum of its proper divisors (21424814).

22115872 is an equidigital number, since it uses as much as digits as its factorization.

22115872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691131 (or 691123 counting only the distinct ones).

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

The square root of 22115872 is about 4702.7515350059. The cubic root of 22115872 is about 280.6950081368.

Adding to 22115872 its reverse (27851122), we get a palindrome (49966994).

The spelling of 22115872 in words is "twenty-two million, one hundred fifteen thousand, eight hundred seventy-two".