12728372 has 6 divisors (see below), whose sum is σ = 22274658. Its totient is φ = 6364184.

The previous prime is 12728371. The next prime is 12728377. The reversal of 12728372 is 27382721.

It can be written as a sum of positive squares in only one way, i.e., 11464996 + 1263376 = 3386^2 + 1124^2 .

It is a super-2 number, since 2×12728372² = 324022907540768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12728371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1591043 + ... + 1591050.

It is an arithmetic number, because the mean of its divisors is an integer number (3712443).

Almost surely, 2^12728372 is an apocalyptic number.

It is an amenable number.

12728372 is a deficient number, since it is larger than the sum of its proper divisors (9546286).

12728372 is a wasteful number, since it uses less digits than its factorization.

12728372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3182097 (or 3182095 counting only the distinct ones).

The product of its digits is 9408, while the sum is 32.

The square root of 12728372 is about 3567.6844030828. The cubic root of 12728372 is about 233.4842660662.

The spelling of 12728372 in words is "twelve million, seven hundred twenty-eight thousand, three hundred seventy-two".