22043728 has 60 divisors (see below), whose sum is σ = 51341952. Its totient is φ = 9132480.

The previous prime is 22043717. The next prime is 22043731. The reversal of 22043728 is 82734022.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 22043696 and 22043705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23851 + ... + 24757.

Almost surely, 2^22043728 is an apocalyptic number.

22043728 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22043728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25670976).

22043728 is an abundant number, since it is smaller than the sum of its proper divisors (29298224).

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

22043728 is a wasteful number, since it uses less digits than its factorization.

22043728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 960 (or 947 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 22043728 is about 4695.0748662828. The cubic root of 22043728 is about 280.3894580432.

The spelling of 22043728 in words is "twenty-two million, forty-three thousand, seven hundred twenty-eight".