28368836221 has 8 divisors (see below), whose sum is σ = 30949077600. Its totient is φ = 25788804240.

The previous prime is 28368836191. The next prime is 28368836227. The reversal of 28368836221 is 12263886382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28368836221 - 2¹³ = 28368828029 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 (28368836227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 403735 + ... + 468763.

It is an arithmetic number, because the mean of its divisors is an integer number (3868634700).

Almost surely, 2^28368836221 is an apocalyptic number.

It is an amenable number.

28368836221 is a deficient number, since it is larger than the sum of its proper divisors (2580241379).

28368836221 is a wasteful number, since it uses less digits than its factorization.

28368836221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104699.

The product of its digits is 1327104, while the sum is 49.

The spelling of 28368836221 in words is "twenty-eight billion, three hundred sixty-eight million, eight hundred thirty-six thousand, two hundred twenty-one".