28686215 has 8 divisors (see below), whose sum is σ = 35156160. Its totient is φ = 22460512.

The previous prime is 28686209. The next prime is 28686223. The reversal of 28686215 is 51268682.

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 28686215 - 2¹⁴ = 28669831 is a prime.

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, 60800 + ... + 61269.

It is an arithmetic number, because the mean of its divisors is an integer number (4394520).

Almost surely, 2^28686215 is an apocalyptic number.

28686215 is a deficient number, since it is larger than the sum of its proper divisors (6469945).

28686215 is a wasteful number, since it uses less digits than its factorization.

28686215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122121.

The product of its digits is 46080, while the sum is 38.

The square root of 28686215 is about 5355.9513627366. The cubic root of 28686215 is about 306.1195618332.

The spelling of 28686215 in words is "twenty-eight million, six hundred eighty-six thousand, two hundred fifteen".