27228561 has 4 divisors (see below), whose sum is σ = 36304752. Its totient is φ = 18152372.

The previous prime is 27228547. The next prime is 27228563. The reversal of 27228561 is 16582272.

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 27228561 - 2⁵ = 27228529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27228563) 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, 4538091 + ... + 4538096.

It is an arithmetic number, because the mean of its divisors is an integer number (9076188).

Almost surely, 2^27228561 is an apocalyptic number.

It is an amenable number.

27228561 is a deficient number, since it is larger than the sum of its proper divisors (9076191).

27228561 is an equidigital number, since it uses as much as digits as its factorization.

27228561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9076190.

The product of its digits is 13440, while the sum is 33.

The square root of 27228561 is about 5218.0993666277. The cubic root of 27228561 is about 300.8441447266.

The spelling of 27228561 in words is "twenty-seven million, two hundred twenty-eight thousand, five hundred sixty-one".