28616215 has 8 divisors (see below), whose sum is σ = 34420320. Its totient is φ = 22839072.

The previous prime is 28616213. The next prime is 28616267. The reversal of 28616215 is 51261682.

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 28616215 - 2¹ = 28616213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28616213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4324 + ... + 8713.

It is an arithmetic number, because the mean of its divisors is an integer number (4302540).

Almost surely, 2^28616215 is an apocalyptic number.

28616215 is a deficient number, since it is larger than the sum of its proper divisors (5804105).

28616215 is a wasteful number, since it uses less digits than its factorization.

28616215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13481.

The product of its digits is 5760, while the sum is 31.

The square root of 28616215 is about 5349.4125845741. The cubic root of 28616215 is about 305.8703617348.

Adding to 28616215 its reverse (51261682), we get a palindrome (79877897).

The spelling of 28616215 in words is "twenty-eight million, six hundred sixteen thousand, two hundred fifteen".