28869829 has 4 divisors (see below), whose sum is σ = 28880620. Its totient is φ = 28859040.

The previous prime is 28869817. The next prime is 28869833. The reversal of 28869829 is 92896882.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 27060804 + 1809025 = 5202^2 + 1345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28869829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28869329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1969 + ... + 7849.

It is an arithmetic number, because the mean of its divisors is an integer number (7220155).

Almost surely, 2^28869829 is an apocalyptic number.

It is an amenable number.

28869829 is a deficient number, since it is larger than the sum of its proper divisors (10791).

28869829 is an equidigital number, since it uses as much as digits as its factorization.

28869829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10790.

The product of its digits is 995328, while the sum is 52.

The square root of 28869829 is about 5373.0651401225. The cubic root of 28869829 is about 306.7713073644.

The spelling of 28869829 in words is "twenty-eight million, eight hundred sixty-nine thousand, eight hundred twenty-nine".