28005637806533 has 4 divisors (see below), whose sum is σ = 29223274232928. Its totient is φ = 26788001380140.

The previous prime is 28005637806473. The next prime is 28005637806547. The reversal of 28005637806533 is 33560873650082.

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 not a de Polignac number, because 28005637806533 - 2⁸ = 28005637806277 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 (28005637800533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 608818213163 + ... + 608818213208.

It is an arithmetic number, because the mean of its divisors is an integer number (7305818558232).

Almost surely, 2^{28005637806533} is an apocalyptic number.

28005637806533 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28005637806533 is a deficient number, since it is larger than the sum of its proper divisors (1217636426395).

28005637806533 is a wasteful number, since it uses less digits than its factorization.

28005637806533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217636426394.

The product of its (nonzero) digits is 21772800, while the sum is 56.

The spelling of 28005637806533 in words is "twenty-eight trillion, five billion, six hundred thirty-seven million, eight hundred six thousand, five hundred thirty-three".