22781232 has 60 divisors (see below), whose sum is σ = 64096344. Its totient is φ = 7553280.

The previous prime is 22781221. The next prime is 22781261. The reversal of 22781232 is 23218722.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 22781196 and 22781205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40183 + ... + 40745.

Almost surely, 2^22781232 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 22781232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32048172).

22781232 is an abundant number, since it is smaller than the sum of its proper divisors (41315112).

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

22781232 is a wasteful number, since it uses less digits than its factorization.

22781232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858 (or 849 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 22781232 is about 4772.9688873907. The cubic root of 22781232 is about 283.4821615643.

Adding to 22781232 its reverse (23218722), we get a palindrome (45999954).

The spelling of 22781232 in words is "twenty-two million, seven hundred eighty-one thousand, two hundred thirty-two".