28245215 has 8 divisors (see below), whose sum is σ = 33933120. Its totient is φ = 22570272.

The previous prime is 28245199. The next prime is 28245227. The reversal of 28245215 is 51254282.

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 28245215 - 2⁴ = 28245199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2477 + ... + 7913.

It is an arithmetic number, because the mean of its divisors is an integer number (4241640).

Almost surely, 2^28245215 is an apocalyptic number.

28245215 is a deficient number, since it is larger than the sum of its proper divisors (5687905).

28245215 is a wasteful number, since it uses less digits than its factorization.

28245215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6481.

The product of its digits is 6400, while the sum is 29.

The square root of 28245215 is about 5314.6227523692. The cubic root of 28245215 is about 304.5427709654.

Adding to 28245215 its reverse (51254282), we get a palindrome (79499497).

The spelling of 28245215 in words is "twenty-eight million, two hundred forty-five thousand, two hundred fifteen".