22643928 has 64 divisors (see below), whose sum is σ = 63744000. Its totient is φ = 7446816.

The previous prime is 22643921. The next prime is 22643969. The reversal of 22643928 is 82934622.

22643928 is a `hidden beast` number, since 2 + 2 + 643 + 9 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 22643892 and 22643901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22643921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16401 + ... + 17727.

It is an arithmetic number, because the mean of its divisors is an integer number (996000).

Almost surely, 2^22643928 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 22643928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31872000).

22643928 is an abundant number, since it is smaller than the sum of its proper divisors (41100072).

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

22643928 is a wasteful number, since it uses less digits than its factorization.

22643928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421 (or 1411 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 22643928 is about 4758.5636488335. The cubic root of 22643928 is about 282.9114915900.

The spelling of 22643928 in words is "twenty-two million, six hundred forty-three thousand, nine hundred twenty-eight".