12720128 has 24 divisors (see below), whose sum is σ = 25438140. Its totient is φ = 6359040.

The previous prime is 12720107. The next prime is 12720133. The reversal of 12720128 is 82102721.

It is a super-3 number, since 3×12720128³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058 + ... + 5153.

Almost surely, 2^12720128 is an apocalyptic number.

It is an amenable number.

12720128 is a deficient number, since it is larger than the sum of its proper divisors (12718012).

12720128 is an frugal number, since it uses more digits than its factorization.

12720128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6233 (or 6213 counting only the distinct ones).

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

The square root of 12720128 is about 3566.5288446892. The cubic root of 12720128 is about 233.4338469447.

Adding to 12720128 its reverse (82102721), we get a palindrome (94822849).

The spelling of 12720128 in words is "twelve million, seven hundred twenty thousand, one hundred twenty-eight".