28969 has 4 divisors (see below), whose sum is σ = 29520. Its totient is φ = 28420.

The previous prime is 28961. The next prime is 28979. The reversal of 28969 is 96982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96982 = 2 ⋅48491.

It is a cyclic number.

It is not a de Polignac number, because 28969 - 2³ = 28961 is a prime.

It is a super-2 number, since 2×28969² = 1678405922, which contains 22 as substring.

It is a Duffinian number.

28969 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (28961) 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 in 3 ways as a sum of consecutive naturals, for example, 187 + ... + 304.

It is an arithmetic number, because the mean of its divisors is an integer number (7380).

2²⁸⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

28969 is a deficient number, since it is larger than the sum of its proper divisors (551).

28969 is an equidigital number, since it uses as much as digits as its factorization.

28969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550.

The product of its digits is 7776, while the sum is 34.

The square root of 28969 is about 170.2028201882. The cubic root of 28969 is about 30.7122170179.

The spelling of 28969 in words is "twenty-eight thousand, nine hundred sixty-nine".