12899728 has 10 divisors (see below), whose sum is σ = 24993254. Its totient is φ = 6449856.

The previous prime is 12899713. The next prime is 12899737. The reversal of 12899728 is 82799821.

It can be written as a sum of positive squares in only one way, i.e., 12616704 + 283024 = 3552^2 + 532^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403101 + ... + 403132.

Almost surely, 2^12899728 is an apocalyptic number.

It is an amenable number.

12899728 is a deficient number, since it is larger than the sum of its proper divisors (12093526).

12899728 is an equidigital number, since it uses as much as digits as its factorization.

12899728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806241 (or 806235 counting only the distinct ones).

The product of its digits is 145152, while the sum is 46.

The square root of 12899728 is about 3591.6191334828. The cubic root of 12899728 is about 234.5273615068.

It can be divided in two parts, 128 and 99728, that added together give a square (99856 = 316²).

The spelling of 12899728 in words is "twelve million, eight hundred ninety-nine thousand, seven hundred twenty-eight".