28550289 has 4 divisors (see below), whose sum is σ = 38067056. Its totient is φ = 19033524.

The previous prime is 28550281. The next prime is 28550299. The reversal of 28550289 is 98205582.

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 not a de Polignac number, because 28550289 - 2³ = 28550281 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28550281) 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, 4758379 + ... + 4758384.

It is an arithmetic number, because the mean of its divisors is an integer number (9516764).

Almost surely, 2^28550289 is an apocalyptic number.

It is an amenable number.

28550289 is a deficient number, since it is larger than the sum of its proper divisors (9516767).

28550289 is an equidigital number, since it uses as much as digits as its factorization.

28550289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9516766.

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 28550289 is about 5343.2470465065. The cubic root of 28550289 is about 305.6352932076.

The spelling of 28550289 in words is "twenty-eight million, five hundred fifty thousand, two hundred eighty-nine".