22303728 has 80 divisors (see below), whose sum is σ = 67808160. Its totient is φ = 6994944.

The previous prime is 22303703. The next prime is 22303751. The reversal of 22303728 is 82730322.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5826 + ... + 8862.

It is an arithmetic number, because the mean of its divisors is an integer number (847602).

Almost surely, 2^22303728 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 22303728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33904080).

22303728 is an abundant number, since it is smaller than the sum of its proper divisors (45504432).

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

22303728 is a wasteful number, since it uses less digits than its factorization.

22303728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3071 (or 3059 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 22303728 is about 4722.6822886999. The cubic root of 22303728 is about 281.4875255670.

The spelling of 22303728 in words is "twenty-two million, three hundred three thousand, seven hundred twenty-eight".