28807 has 2 divisors, whose sum is σ = 28808. Its totient is φ = 28806.

The previous prime is 28793. The next prime is 28813. The reversal of 28807 is 70882.

28807 is nontrivially palindromic in base 2 and base 8.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28807 - 2¹¹ = 26759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14403 + 14404.

It is an arithmetic number, because the mean of its divisors is an integer number (14404).

2²⁸⁸⁰⁷ is an apocalyptic number.

28807 is a deficient number, since it is larger than the sum of its proper divisors (1).

28807 is an equidigital number, since it uses as much as digits as its factorization.

28807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 28807 is about 169.7262501795. The cubic root of 28807 is about 30.6548605048.

Subtracting from 28807 its sum of digits (25), we obtain a palindrome (28782).

The spelling of 28807 in words is "twenty-eight thousand, eight hundred seven".