22304728 has 8 divisors (see below), whose sum is σ = 41821380. Its totient is φ = 11152360.

The previous prime is 22304719. The next prime is 22304729. The reversal of 22304728 is 82740322.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 22304696 and 22304705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22304729) by changing a digit.

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 as a sum of consecutive naturals, namely, 1394038 + ... + 1394053.

Almost surely, 2^22304728 is an apocalyptic number.

It is an amenable number.

22304728 is a deficient number, since it is larger than the sum of its proper divisors (19516652).

22304728 is a wasteful number, since it uses less digits than its factorization.

22304728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2788097 (or 2788093 counting only the distinct ones).

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

The square root of 22304728 is about 4722.7881595515. The cubic root of 22304728 is about 281.4917323872.

It can be divided in two parts, 22304 and 728, that added together give a palindrome (23032).

The spelling of 22304728 in words is "twenty-two million, three hundred four thousand, seven hundred twenty-eight".