28623305 has 4 divisors (see below), whose sum is σ = 34347972. Its totient is φ = 22898640.

The previous prime is 28623277. The next prime is 28623307. The reversal of 28623305 is 50332682.

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 11075584 + 17547721 = 3328^2 + 4189^2 .

It is not a de Polignac number, because 28623305 - 2¹⁸ = 28361161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28623307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2862326 + ... + 2862335.

It is an arithmetic number, because the mean of its divisors is an integer number (8586993).

Almost surely, 2^28623305 is an apocalyptic number.

It is an amenable number.

28623305 is a deficient number, since it is larger than the sum of its proper divisors (5724667).

28623305 is an equidigital number, since it uses as much as digits as its factorization.

28623305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5724666.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 28623305 is about 5350.0752331159. The cubic root of 28623305 is about 305.8956206284.

Adding to 28623305 its reverse (50332682), we get a palindrome (78955987).

The spelling of 28623305 in words is "twenty-eight million, six hundred twenty-three thousand, three hundred five".