28828869 has 4 divisors (see below), whose sum is σ = 38438496. Its totient is φ = 19219244.

The previous prime is 28828861. The next prime is 28828901. The reversal of 28828869 is 96882882.

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 cyclic number.

It is not a de Polignac number, because 28828869 - 2³ = 28828861 is a prime.

It is a super-2 number, since 2×28828869² = 1662207375638322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28828861) 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, 4804809 + ... + 4804814.

It is an arithmetic number, because the mean of its divisors is an integer number (9609624).

Almost surely, 2^28828869 is an apocalyptic number.

It is an amenable number.

28828869 is a deficient number, since it is larger than the sum of its proper divisors (9609627).

28828869 is an equidigital number, since it uses as much as digits as its factorization.

28828869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9609626.

The product of its digits is 884736, while the sum is 51.

The square root of 28828869 is about 5369.2521825670. The cubic root of 28828869 is about 306.6261581392.

The spelling of 28828869 in words is "twenty-eight million, eight hundred twenty-eight thousand, eight hundred sixty-nine".