28390992009 has 4 divisors (see below), whose sum is σ = 37854656016. Its totient is φ = 18927328004.

The previous prime is 28390991989. The next prime is 28390992023. The reversal of 28390992009 is 90029909382.

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 28390992009 - 2⁸ = 28390991753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28390992029) 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, 4731831999 + ... + 4731832004.

It is an arithmetic number, because the mean of its divisors is an integer number (9463664004).

Almost surely, 2^28390992009 is an apocalyptic number.

It is an amenable number.

28390992009 is a deficient number, since it is larger than the sum of its proper divisors (9463664007).

28390992009 is an equidigital number, since it uses as much as digits as its factorization.

28390992009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9463664006.

The product of its (nonzero) digits is 629856, while the sum is 51.

The spelling of 28390992009 in words is "twenty-eight billion, three hundred ninety million, nine hundred ninety-two thousand, nine".