28043669 has 4 divisors (see below), whose sum is σ = 28801644. Its totient is φ = 27285696.

The previous prime is 28043663. The next prime is 28043671. The reversal of 28043669 is 96634082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21743569 + 6300100 = 4663^2 + 2510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28043669 is a prime.

It is a super-2 number, since 2×28043669² = 1572894741963122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28043663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378932 + ... + 379005.

It is an arithmetic number, because the mean of its divisors is an integer number (7200411).

Almost surely, 2^28043669 is an apocalyptic number.

It is an amenable number.

28043669 is a deficient number, since it is larger than the sum of its proper divisors (757975).

28043669 is an equidigital number, since it uses as much as digits as its factorization.

28043669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757974.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 28043669 is about 5295.6273471611. The cubic root of 28043669 is about 303.8166780523.

The spelling of 28043669 in words is "twenty-eight million, forty-three thousand, six hundred sixty-nine".