28006 has 16 divisors (see below), whose sum is σ = 48960. Its totient is φ = 11880.

The previous prime is 28001. The next prime is 28019. The reversal of 28006 is 60082.

28006 = 29² + 30² + ... + 47².

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28001) by changing a digit.

28006 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385 + ... + 451.

It is an arithmetic number, because the mean of its divisors is an integer number (3060).

2²⁸⁰⁰⁶ is an apocalyptic number.

28006 is a deficient number, since it is larger than the sum of its proper divisors (20954).

28006 is a wasteful number, since it uses less digits than its factorization.

28006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 28006 is about 167.3499327756. The cubic root of 28006 is about 30.3680585560.

Adding to 28006 its reverse (60082), we get a palindrome (88088).

It can be divided in two parts, 2 and 8006, that added together give a palindrome (8008).

The spelling of 28006 in words is "twenty-eight thousand, six".