28847561 has 4 divisors (see below), whose sum is σ = 29212800. Its totient is φ = 28482324.

The previous prime is 28847551. The next prime is 28847573. The reversal of 28847561 is 16574882.

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 28847561 - 2¹⁰ = 28846537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28847551) 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, 182501 + ... + 182658.

It is an arithmetic number, because the mean of its divisors is an integer number (7303200).

Almost surely, 2^28847561 is an apocalyptic number.

It is an amenable number.

28847561 is a deficient number, since it is larger than the sum of its proper divisors (365239).

28847561 is an equidigital number, since it uses as much as digits as its factorization.

28847561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365238.

The product of its digits is 107520, while the sum is 41.

The square root of 28847561 is about 5370.9925525921. The cubic root of 28847561 is about 306.6924136910.

The spelling of 28847561 in words is "twenty-eight million, eight hundred forty-seven thousand, five hundred sixty-one".