22528405 has 4 divisors (see below), whose sum is σ = 27034092. Its totient is φ = 18022720.

The previous prime is 22528399. The next prime is 22528409. The reversal of 22528405 is 50482522.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6584356 + 15944049 = 2566^2 + 3993^2 .

It is not a de Polignac number, because 22528405 - 2³ = 22528397 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22528409) 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 in 3 ways as a sum of consecutive naturals, for example, 2252836 + ... + 2252845.

It is an arithmetic number, because the mean of its divisors is an integer number (6758523).

Almost surely, 2^22528405 is an apocalyptic number.

It is an amenable number.

22528405 is a deficient number, since it is larger than the sum of its proper divisors (4505687).

22528405 is an equidigital number, since it uses as much as digits as its factorization.

22528405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4505686.

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 22528405 is about 4746.4096957595. The cubic root of 22528405 is about 282.4295592770.

The spelling of 22528405 in words is "twenty-two million, five hundred twenty-eight thousand, four hundred five".