12271728 has 40 divisors (see below), whose sum is σ = 36231808. Its totient is φ = 3506112.

The previous prime is 12271717. The next prime is 12271741. The reversal of 12271728 is 82717221.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 12271695 and 12271704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17926 + ... + 18597.

Almost surely, 2^12271728 is an apocalyptic number.

It is an amenable number.

12271728 is an abundant number, since it is smaller than the sum of its proper divisors (23960080).

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

12271728 is a wasteful number, since it uses less digits than its factorization.

12271728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36541 (or 36535 counting only the distinct ones).

The product of its digits is 3136, while the sum is 30.

The square root of 12271728 is about 3503.1026248170. The cubic root of 12271728 is about 230.6580273790.

Adding to 12271728 its reverse (82717221), we get a palindrome (94988949).

The spelling of 12271728 in words is "twelve million, two hundred seventy-one thousand, seven hundred twenty-eight".