28663808399 has 4 divisors (see below), whose sum is σ = 29149635720. Its totient is φ = 28177981080.

The previous prime is 28663808377. The next prime is 28663808417. The reversal of 28663808399 is 99380836682.

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

It is a cyclic number.

It is not a de Polignac number, because 28663808399 - 2³² = 24368841103 is a prime.

It is a super-2 number, since 2×28663808399² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28663808309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242913572 + ... + 242913689.

It is an arithmetic number, because the mean of its divisors is an integer number (7287408930).

Almost surely, 2^28663808399 is an apocalyptic number.

28663808399 is a deficient number, since it is larger than the sum of its proper divisors (485827321).

28663808399 is an equidigital number, since it uses as much as digits as its factorization.

28663808399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485827320.

The product of its (nonzero) digits is 26873856, while the sum is 62.

The spelling of 28663808399 in words is "twenty-eight billion, six hundred sixty-three million, eight hundred eight thousand, three hundred ninety-nine".