22728559 has 4 divisors (see below), whose sum is σ = 25975504. Its totient is φ = 19481616.

The previous prime is 22728529. The next prime is 22728569. The reversal of 22728559 is 95582722.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 22728559 - 2¹⁵ = 22695791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22728529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1623462 + ... + 1623475.

It is an arithmetic number, because the mean of its divisors is an integer number (6493876).

Almost surely, 2^22728559 is an apocalyptic number.

22728559 is a deficient number, since it is larger than the sum of its proper divisors (3246945).

22728559 is an equidigital number, since it uses as much as digits as its factorization.

22728559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3246944.

The product of its digits is 100800, while the sum is 40.

The square root of 22728559 is about 4767.4478497410. The cubic root of 22728559 is about 283.2635111303.

The spelling of 22728559 in words is "twenty-two million, seven hundred twenty-eight thousand, five hundred fifty-nine".