12201728 has 72 divisors (see below), whose sum is σ = 30414720. Its totient is φ = 4746240.

The previous prime is 12201719. The next prime is 12201737. The reversal of 12201728 is 82710221.

It is an interprime number because it is at equal distance from previous prime (12201719) and next prime (12201737).

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, 19403 + ... + 20021.

Almost surely, 2^12201728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12201728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15207360).

12201728 is an abundant number, since it is smaller than the sum of its proper divisors (18212992).

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

12201728 is an equidigital number, since it uses as much as digits as its factorization.

12201728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653 (or 639 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 12201728 is about 3493.0971930366. The cubic root of 12201728 is about 230.2186201082.

Adding to 12201728 its reverse (82710221), we get a palindrome (94911949).

The spelling of 12201728 in words is "twelve million, two hundred one thousand, seven hundred twenty-eight".