28563241 has 4 divisors (see below), whose sum is σ = 32643712. Its totient is φ = 24482772.

The previous prime is 28563211. The next prime is 28563253. The reversal of 28563241 is 14236582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28563241 - 2⁷ = 28563113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28563211) 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, 2040225 + ... + 2040238.

It is an arithmetic number, because the mean of its divisors is an integer number (8160928).

Almost surely, 2^28563241 is an apocalyptic number.

It is an amenable number.

28563241 is a deficient number, since it is larger than the sum of its proper divisors (4080471).

28563241 is an equidigital number, since it uses as much as digits as its factorization.

28563241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4080470.

The product of its digits is 11520, while the sum is 31.

The square root of 28563241 is about 5344.4589061943. The cubic root of 28563241 is about 305.6815039466.

The spelling of 28563241 in words is "twenty-eight million, five hundred sixty-three thousand, two hundred forty-one".