28665215 has 8 divisors (see below), whose sum is σ = 34445088. Its totient is φ = 22900960.

The previous prime is 28665211. The next prime is 28665223. The reversal of 28665215 is 51256682.

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

It is not a de Polignac number, because 28665215 - 2² = 28665211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28665211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 614 + ... + 7596.

It is an arithmetic number, because the mean of its divisors is an integer number (4305636).

Almost surely, 2^28665215 is an apocalyptic number.

28665215 is a deficient number, since it is larger than the sum of its proper divisors (5779873).

28665215 is an equidigital number, since it uses as much as digits as its factorization.

28665215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7809.

The product of its digits is 28800, while the sum is 35.

The square root of 28665215 is about 5353.9905677915. The cubic root of 28665215 is about 306.0448444110.

The spelling of 28665215 in words is "twenty-eight million, six hundred sixty-five thousand, two hundred fifteen".