28280215 has 8 divisors (see below), whose sum is σ = 35031168. Its totient is φ = 21894240.

The previous prime is 28280209. The next prime is 28280237. The reversal of 28280215 is 51208282.

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

It is not a de Polignac number, because 28280215 - 2¹⁵ = 28247447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91072 + ... + 91381.

It is an arithmetic number, because the mean of its divisors is an integer number (4378896).

Almost surely, 2^28280215 is an apocalyptic number.

28280215 is a deficient number, since it is larger than the sum of its proper divisors (6750953).

28280215 is a wasteful number, since it uses less digits than its factorization.

28280215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182489.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 28280215 is about 5317.9145348529. The cubic root of 28280215 is about 304.6685102256.

Adding to 28280215 its reverse (51208282), we get a palindrome (79488497).

The spelling of 28280215 in words is "twenty-eight million, two hundred eighty thousand, two hundred fifteen".