28829239 has 4 divisors (see below), whose sum is σ = 28996056. Its totient is φ = 28662424.

The previous prime is 28829237. The next prime is 28829249. The reversal of 28829239 is 93292882.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28829239 - 2¹ = 28829237 is a prime.

It is a super-2 number, since 2×28829239² = 1662250042638242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28829195 and 28829204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28829231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83149 + ... + 83494.

It is an arithmetic number, because the mean of its divisors is an integer number (7249014).

Almost surely, 2^28829239 is an apocalyptic number.

28829239 is a deficient number, since it is larger than the sum of its proper divisors (166817).

28829239 is a wasteful number, since it uses less digits than its factorization.

28829239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166816.

The product of its digits is 124416, while the sum is 43.

The square root of 28829239 is about 5369.2866379064. The cubic root of 28829239 is about 306.6274699167.

It can be divided in two parts, 2882 and 9239, that added together give a palindrome (12121).

The spelling of 28829239 in words is "twenty-eight million, eight hundred twenty-nine thousand, two hundred thirty-nine".