12728776 has 8 divisors (see below), whose sum is σ = 23866470. Its totient is φ = 6364384.

The previous prime is 12728773. The next prime is 12728831. The reversal of 12728776 is 67782721.

It can be written as a sum of positive squares in only one way, i.e., 9156676 + 3572100 = 3026^2 + 1890^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (12728773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 795541 + ... + 795556.

Almost surely, 2^12728776 is an apocalyptic number.

It is an amenable number.

12728776 is a deficient number, since it is larger than the sum of its proper divisors (11137694).

12728776 is a wasteful number, since it uses less digits than its factorization.

12728776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591103 (or 1591099 counting only the distinct ones).

The product of its digits is 65856, while the sum is 40.

The square root of 12728776 is about 3567.7410219914. The cubic root of 12728776 is about 233.4867363126.

The spelling of 12728776 in words is "twelve million, seven hundred twenty-eight thousand, seven hundred seventy-six".