28195239 has 8 divisors (see below), whose sum is σ = 37624192. Its totient is φ = 18781560.

The previous prime is 28195201. The next prime is 28195247. The reversal of 28195239 is 93259182.

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

It is not a de Polignac number, because 28195239 - 2⁸ = 28194983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28195197 and 28195206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28195039) 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, 1584 + ... + 7674.

It is an arithmetic number, because the mean of its divisors is an integer number (4703024).

Almost surely, 2^28195239 is an apocalyptic number.

28195239 is a deficient number, since it is larger than the sum of its proper divisors (9428953).

28195239 is a wasteful number, since it uses less digits than its factorization.

28195239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7637.

The product of its digits is 38880, while the sum is 39.

The square root of 28195239 is about 5309.9189259347. The cubic root of 28195239 is about 304.3630494938.

The spelling of 28195239 in words is "twenty-eight million, one hundred ninety-five thousand, two hundred thirty-nine".