12728947 has 8 divisors (see below), whose sum is σ = 15869952. Its totient is φ = 9918600.

The previous prime is 12728939. The next prime is 12728977. The reversal of 12728947 is 74982721.

12728947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 12728947 - 2³ = 12728939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12728927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82579 + ... + 82732.

It is an arithmetic number, because the mean of its divisors is an integer number (1983744).

Almost surely, 2^12728947 is an apocalyptic number.

12728947 is a deficient number, since it is larger than the sum of its proper divisors (3141005).

12728947 is a wasteful number, since it uses less digits than its factorization.

12728947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165329.

The product of its digits is 56448, while the sum is 40.

The square root of 12728947 is about 3567.7649866548. The cubic root of 12728947 is about 233.4877818715.

The spelling of 12728947 in words is "twelve million, seven hundred twenty-eight thousand, nine hundred forty-seven".