28820829 has 4 divisors (see below), whose sum is σ = 38427776. Its totient is φ = 19213884.

The previous prime is 28820819. The next prime is 28820833. The reversal of 28820829 is 92802882.

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.

It is a de Polignac number, because none of the positive numbers 2^k-28820829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28820819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4803469 + ... + 4803474.

It is an arithmetic number, because the mean of its divisors is an integer number (9606944).

Almost surely, 2^28820829 is an apocalyptic number.

It is an amenable number.

28820829 is a deficient number, since it is larger than the sum of its proper divisors (9606947).

28820829 is an equidigital number, since it uses as much as digits as its factorization.

28820829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9606946.

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 28820829 is about 5368.5034227427. The cubic root of 28820829 is about 306.5976507944.

The spelling of 28820829 in words is "twenty-eight million, eight hundred twenty thousand, eight hundred twenty-nine".