12728455 has 4 divisors (see below), whose sum is σ = 15274152. Its totient is φ = 10182760.

The previous prime is 12728447. The next prime is 12728479. The reversal of 12728455 is 55482721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12728455 - 2³ = 12728447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12728455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1272841 + ... + 1272850.

It is an arithmetic number, because the mean of its divisors is an integer number (3818538).

Almost surely, 2^12728455 is an apocalyptic number.

12728455 is a deficient number, since it is larger than the sum of its proper divisors (2545697).

12728455 is an equidigital number, since it uses as much as digits as its factorization.

12728455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545696.

The product of its digits is 22400, while the sum is 34.

The square root of 12728455 is about 3567.6960352586. The cubic root of 12728455 is about 233.4847735716.

It can be divided in two parts, 127 and 28455, that added together give a palindrome (28582).

The spelling of 12728455 in words is "twelve million, seven hundred twenty-eight thousand, four hundred fifty-five".