28304358509 has 16 divisors (see below), whose sum is σ = 34000674048. Its totient is φ = 23036652672.

The previous prime is 28304358503. The next prime is 28304358529. The reversal of 28304358509 is 90585340382.

It is a cyclic number.

It is not a de Polignac number, because 28304358509 - 2²⁴ = 28287581293 is a prime.

It is a super-2 number, since 2×28304358509² (a number of 22 digits) 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 (28304358503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 619562 + ... + 663675.

It is an arithmetic number, because the mean of its divisors is an integer number (2125042128).

Almost surely, 2^28304358509 is an apocalyptic number.

It is an amenable number.

28304358509 is a deficient number, since it is larger than the sum of its proper divisors (5696315539).

28304358509 is a wasteful number, since it uses less digits than its factorization.

28304358509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283404.

The product of its (nonzero) digits is 1036800, while the sum is 47.

The spelling of 28304358509 in words is "twenty-eight billion, three hundred four million, three hundred fifty-eight thousand, five hundred nine".