28089829 has 6 divisors (see below), whose sum is σ = 28561650. Its totient is φ = 27625680.

The previous prime is 28089821. The next prime is 28089833. The reversal of 28089829 is 92898082.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 21025 + 28068804 = 145^2 + 5298^2 .

It is not a de Polignac number, because 28089829 - 2³ = 28089821 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 (28089821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54 + ... + 7495.

It is an arithmetic number, because the mean of its divisors is an integer number (4760275).

Almost surely, 2^28089829 is an apocalyptic number.

It is an amenable number.

28089829 is a deficient number, since it is larger than the sum of its proper divisors (471821).

28089829 is an frugal number, since it uses more digits than its factorization.

28089829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7671 (or 7610 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 28089829 is about 5299.9838679000. The cubic root of 28089829 is about 303.9832811962.

It can be divided in two parts, 280 and 89829, that added together give a palindrome (90109).

The spelling of 28089829 in words is "twenty-eight million, eighty-nine thousand, eight hundred twenty-nine".