28237990009 has 4 divisors (see below), whose sum is σ = 28700907940. Its totient is φ = 27775072080.

The previous prime is 28237990007. The next prime is 28237990139. The reversal of 28237990009 is 90009973282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11923548025 + 16314441984 = 109195^2 + 127728^2 .

It is a cyclic number.

It is not a de Polignac number, because 28237990009 - 2¹ = 28237990007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28237990007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231458874 + ... + 231458995.

It is an arithmetic number, because the mean of its divisors is an integer number (7175226985).

Almost surely, 2^28237990009 is an apocalyptic number.

It is an amenable number.

28237990009 is a deficient number, since it is larger than the sum of its proper divisors (462917931).

28237990009 is an equidigital number, since it uses as much as digits as its factorization.

28237990009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462917930.

The product of its (nonzero) digits is 489888, while the sum is 49.

The spelling of 28237990009 in words is "twenty-eight billion, two hundred thirty-seven million, nine hundred ninety thousand, nine".