12928669 has 12 divisors (see below), whose sum is σ = 14144436. Its totient is φ = 11811072.

The previous prime is 12928637. The next prime is 12928673. The reversal of 12928669 is 96682921.

12928669 = 1² + 2² + ... + 338².

12928669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 1625625 + 11303044 = 1275^2 + 3362^2 .

It is not a de Polignac number, because 12928669 - 2⁵ = 12928637 is a prime.

It is a super-2 number, since 2×12928669² = 334300964223122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12928679) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18759 + ... + 19435.

It is an arithmetic number, because the mean of its divisors is an integer number (1178703).

Almost surely, 2^12928669 is an apocalyptic number.

It is an amenable number.

12928669 is a deficient number, since it is larger than the sum of its proper divisors (1215767).

12928669 is a wasteful number, since it uses less digits than its factorization.

12928669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816 (or 803 counting only the distinct ones).

The product of its digits is 93312, while the sum is 43.

The square root of 12928669 is about 3595.6458390670. The cubic root of 12928669 is about 234.7026206730.

The spelling of 12928669 in words is "twelve million, nine hundred twenty-eight thousand, six hundred sixty-nine".