28055006509 has 4 divisors (see below), whose sum is σ = 28057538080. Its totient is φ = 28052474940.

The previous prime is 28055006489. The next prime is 28055006521. The reversal of 28055006509 is 90560055082.

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 28055006509 - 2¹³ = 28054998317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28055001509) 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, 1249089 + ... + 1271350.

It is an arithmetic number, because the mean of its divisors is an integer number (7014384520).

Almost surely, 2^28055006509 is an apocalyptic number.

It is an amenable number.

28055006509 is a deficient number, since it is larger than the sum of its proper divisors (2531571).

28055006509 is a wasteful number, since it uses less digits than its factorization.

28055006509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2531570.

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 28055006509 in words is "twenty-eight billion, fifty-five million, six thousand, five hundred nine".