28225789 has 4 divisors (see below), whose sum is σ = 28373760. Its totient is φ = 28077820.

The previous prime is 28225741. The next prime is 28225793. The reversal of 28225789 is 98752282.

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 28225789 - 2¹⁹ = 27701501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28225189) 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, 73699 + ... + 74080.

It is an arithmetic number, because the mean of its divisors is an integer number (7093440).

Almost surely, 2^28225789 is an apocalyptic number.

It is an amenable number.

28225789 is a deficient number, since it is larger than the sum of its proper divisors (147971).

28225789 is a wasteful number, since it uses less digits than its factorization.

28225789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147970.

The product of its digits is 161280, while the sum is 43.

The square root of 28225789 is about 5312.7948388772. The cubic root of 28225789 is about 304.4729372529.

The spelling of 28225789 in words is "twenty-eight million, two hundred twenty-five thousand, seven hundred eighty-nine".