28789 has 2 divisors, whose sum is σ = 28790. Its totient is φ = 28788.

The previous prime is 28771. The next prime is 28793. The reversal of 28789 is 98782.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27889 + 900 = 167^2 + 30^2 .

It is a cyclic number.

It is not a de Polignac number, because 28789 - 2⁷ = 28661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14394 + 14395.

It is an arithmetic number, because the mean of its divisors is an integer number (14395).

2²⁸⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

28789 is a deficient number, since it is larger than the sum of its proper divisors (1).

28789 is an equidigital number, since it uses as much as digits as its factorization.

28789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 34.

The square root of 28789 is about 169.6732153288. The cubic root of 28789 is about 30.6484742971.

It can be divided in two parts, 2 and 8789, that multiplied together give a triangular number (17578 = T₁₈₇).

The spelling of 28789 in words is "twenty-eight thousand, seven hundred eighty-nine".