28200215 has 4 divisors (see below), whose sum is σ = 33840264. Its totient is φ = 22560168.

The previous prime is 28200203. The next prime is 28200241. The reversal of 28200215 is 51200282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28200215 - 2²⁰ = 27151639 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 3 ways as a sum of consecutive naturals, for example, 2820017 + ... + 2820026.

It is an arithmetic number, because the mean of its divisors is an integer number (8460066).

Almost surely, 2^28200215 is an apocalyptic number.

28200215 is a deficient number, since it is larger than the sum of its proper divisors (5640049).

28200215 is an equidigital number, since it uses as much as digits as its factorization.

28200215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5640048.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 28200215 is about 5310.3874623233. The cubic root of 28200215 is about 304.3809534792.

Adding to 28200215 its reverse (51200282), we get a palindrome (79400497).

The spelling of 28200215 in words is "twenty-eight million, two hundred thousand, two hundred fifteen".