28809621033 has 4 divisors (see below), whose sum is σ = 38412828048. Its totient is φ = 19206414020.

The previous prime is 28809621031. The next prime is 28809621089. The reversal of 28809621033 is 33012690882.

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 28809621033 - 2¹ = 28809621031 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28809621031) 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, 4801603503 + ... + 4801603508.

It is an arithmetic number, because the mean of its divisors is an integer number (9603207012).

Almost surely, 2^28809621033 is an apocalyptic number.

It is an amenable number.

28809621033 is a deficient number, since it is larger than the sum of its proper divisors (9603207015).

28809621033 is an equidigital number, since it uses as much as digits as its factorization.

28809621033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9603207014.

The product of its (nonzero) digits is 124416, while the sum is 42.

The spelling of 28809621033 in words is "twenty-eight billion, eight hundred nine million, six hundred twenty-one thousand, thirty-three".