28821838212 has 18 divisors (see below), whose sum is σ = 72855202238. Its totient is φ = 9607279392.

The previous prime is 28821838187. The next prime is 28821838217. The reversal of 28821838212 is 21283812882.

It can be written as a sum of positive squares in only one way, i.e., 15851817216 + 12970020996 = 125904^2 + 113886^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (28821838217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 400303273 + ... + 400303344.

Almost surely, 2^28821838212 is an apocalyptic number.

It is an amenable number.

28821838212 is an abundant number, since it is smaller than the sum of its proper divisors (44033364026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28821838212 is a wasteful number, since it uses less digits than its factorization.

28821838212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800606627 (or 800606622 counting only the distinct ones).

The product of its digits is 196608, while the sum is 45.

The spelling of 28821838212 in words is "twenty-eight billion, eight hundred twenty-one million, eight hundred thirty-eight thousand, two hundred twelve".