12218272728 has 16 divisors (see below), whose sum is σ = 30545681880. Its totient is φ = 4072757568.

The previous prime is 12218272723. The next prime is 12218272739. The reversal of 12218272728 is 82727281221.

It is a self number, because there is not a number n which added to its sum of digits gives 12218272728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12218272723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254547325 + ... + 254547372.

Almost surely, 2^12218272728 is an apocalyptic number.

It is an amenable number.

12218272728 is an abundant number, since it is smaller than the sum of its proper divisors (18327409152).

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

12218272728 is a wasteful number, since it uses less digits than its factorization.

12218272728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509094706 (or 509094702 counting only the distinct ones).

The product of its digits is 100352, while the sum is 42.

The spelling of 12218272728 in words is "twelve billion, two hundred eighteen million, two hundred seventy-two thousand, seven hundred twenty-eight".