28312306212 has 12 divisors (see below), whose sum is σ = 66062047856. Its totient is φ = 9437435400.

The previous prime is 28312306207. The next prime is 28312306229. The reversal of 28312306212 is 21260321382.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 28312306212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1179679414 + ... + 1179679437.

Almost surely, 2^28312306212 is an apocalyptic number.

It is an amenable number.

28312306212 is an abundant number, since it is smaller than the sum of its proper divisors (37749741644).

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

28312306212 is a wasteful number, since it uses less digits than its factorization.

28312306212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2359358858 (or 2359358856 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

Adding to 28312306212 its reverse (21260321382), we get a palindrome (49572627594).

The spelling of 28312306212 in words is "twenty-eight billion, three hundred twelve million, three hundred six thousand, two hundred twelve".