12188728 has 64 divisors (see below), whose sum is σ = 26244000. Its totient is φ = 5271552.

The previous prime is 12188723. The next prime is 12188749. The reversal of 12188728 is 82788121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12188723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136908 + ... + 136996.

Almost surely, 2^12188728 is an apocalyptic number.

It is an amenable number.

12188728 is an abundant number, since it is smaller than the sum of its proper divisors (14055272).

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

12188728 is a wasteful number, since it uses less digits than its factorization.

12188728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 180 counting only the distinct ones).

The product of its digits is 14336, while the sum is 37.

The square root of 12188728 is about 3491.2358843252. The cubic root of 12188728 is about 230.1368309941.

The spelling of 12188728 in words is "twelve million, one hundred eighty-eight thousand, seven hundred twenty-eight".