12699728 has 10 divisors (see below), whose sum is σ = 24605754. Its totient is φ = 6349856.

The previous prime is 12699721. The next prime is 12699751. The reversal of 12699728 is 82799621.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10705984 + 1993744 = 3272^2 + 1412^2 .

It is a super-2 number, since 2×12699728² = 322566182547968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12699721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 396851 + ... + 396882.

Almost surely, 2^12699728 is an apocalyptic number.

It is an amenable number.

12699728 is a deficient number, since it is larger than the sum of its proper divisors (11906026).

12699728 is an equidigital number, since it uses as much as digits as its factorization.

12699728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793741 (or 793735 counting only the distinct ones).

The product of its digits is 108864, while the sum is 44.

The square root of 12699728 is about 3563.6677735165. The cubic root of 12699728 is about 233.3089897506.

The spelling of 12699728 in words is "twelve million, six hundred ninety-nine thousand, seven hundred twenty-eight".