28519865 has 8 divisors (see below), whose sum is σ = 37335168. Its totient is φ = 20741680.

The previous prime is 28519837. The next prime is 28519867. The reversal of 28519865 is 56891582.

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

It is not a de Polignac number, because 28519865 - 2⁶ = 28519801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28519867) 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, 259217 + ... + 259326.

It is an arithmetic number, because the mean of its divisors is an integer number (4666896).

Almost surely, 2^28519865 is an apocalyptic number.

It is an amenable number.

28519865 is a deficient number, since it is larger than the sum of its proper divisors (8815303).

28519865 is a wasteful number, since it uses less digits than its factorization.

28519865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518559.

The product of its digits is 172800, while the sum is 44.

The square root of 28519865 is about 5340.3993296382. The cubic root of 28519865 is about 305.5266900678.

The spelling of 28519865 in words is "twenty-eight million, five hundred nineteen thousand, eight hundred sixty-five".