12728385 has 24 divisors (see below), whose sum is σ = 23225280. Its totient is φ = 6430752.

The previous prime is 12728381. The next prime is 12728389. The reversal of 12728385 is 58382721.

12728385 is a `hidden beast` number, since 1 + 272 + 8 + 385 = 666.

It is an interprime number because it is at equal distance from previous prime (12728381) and next prime (12728389).

It is not a de Polignac number, because 12728385 - 2² = 12728381 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12728381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6589 + ... + 8298.

It is an arithmetic number, because the mean of its divisors is an integer number (967720).

Almost surely, 2^12728385 is an apocalyptic number.

12728385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12728385 is a deficient number, since it is larger than the sum of its proper divisors (10496895).

12728385 is a wasteful number, since it uses less digits than its factorization.

12728385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14917 (or 14914 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 12728385 is about 3567.6862249923. The cubic root of 12728385 is about 233.4843455552.

The spelling of 12728385 in words is "twelve million, seven hundred twenty-eight thousand, three hundred eighty-five".