28207 has 4 divisors (see below), whose sum is σ = 28696. Its totient is φ = 27720.

The previous prime is 28201. The next prime is 28211. The reversal of 28207 is 70282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70282 = 2 ⋅35141.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28207 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 (28201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144 + ... + 277.

It is an arithmetic number, because the mean of its divisors is an integer number (7174).

2²⁸²⁰⁷ is an apocalyptic number.

28207 is a deficient number, since it is larger than the sum of its proper divisors (489).

28207 is an equidigital number, since it uses as much as digits as its factorization.

28207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 28207 is about 167.9493971409. The cubic root of 28207 is about 30.4405362976.

Adding to 28207 its reverse (70282), we get a palindrome (98489).

The spelling of 28207 in words is "twenty-eight thousand, two hundred seven".