28395289 has 8 divisors (see below), whose sum is σ = 30627072. Its totient is φ = 26170320.

The previous prime is 28395281. The next prime is 28395293. The reversal of 28395289 is 98259382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28395289 - 2³ = 28395281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28395281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9954 + ... + 12484.

It is an arithmetic number, because the mean of its divisors is an integer number (3828384).

Almost surely, 2^28395289 is an apocalyptic number.

It is an amenable number.

28395289 is a deficient number, since it is larger than the sum of its proper divisors (2231783).

28395289 is a wasteful number, since it uses less digits than its factorization.

28395289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3407.

The product of its digits is 311040, while the sum is 46.

The square root of 28395289 is about 5328.7230177595. The cubic root of 28395289 is about 305.0811895298.

It can be divided in two parts, 2839 and 5289, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 28395289 in words is "twenty-eight million, three hundred ninety-five thousand, two hundred eighty-nine".