12728895 has 8 divisors (see below), whose sum is σ = 20366256. Its totient is φ = 6788736.

The previous prime is 12728893. The next prime is 12728923. The reversal of 12728895 is 59882721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12728895 - 2¹ = 12728893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12728893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 424282 + ... + 424311.

It is an arithmetic number, because the mean of its divisors is an integer number (2545782).

Almost surely, 2^12728895 is an apocalyptic number.

12728895 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12728895 is a deficient number, since it is larger than the sum of its proper divisors (7637361).

12728895 is an equidigital number, since it uses as much as digits as its factorization.

12728895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848601.

The product of its digits is 80640, while the sum is 42.

The square root of 12728895 is about 3567.7576991718. The cubic root of 12728895 is about 233.4874639248.

The spelling of 12728895 in words is "twelve million, seven hundred twenty-eight thousand, eight hundred ninety-five".