22240728 has 24 divisors (see below), whose sum is σ = 60235500. Its totient is φ = 7413552.

The previous prime is 22240721. The next prime is 22240739. The reversal of 22240728 is 82704222.

It is a tau number, because it is divible by the number of its divisors (24).

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22240721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 154378 + ... + 154521.

Almost surely, 2^22240728 is an apocalyptic number.

It is an amenable number.

22240728 is an abundant number, since it is smaller than the sum of its proper divisors (37994772).

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

22240728 is a wasteful number, since it uses less digits than its factorization.

22240728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308911 (or 308904 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 22240728 is about 4716.0076335816. The cubic root of 22240728 is about 281.2222420013. Note that the first 4 decimals are identical.

The spelling of 22240728 in words is "twenty-two million, two hundred forty thousand, seven hundred twenty-eight".