28665844 has 6 divisors (see below), whose sum is σ = 50165234. Its totient is φ = 14332920.

The previous prime is 28665839. The next prime is 28665869. The reversal of 28665844 is 44856682.

It can be written as a sum of positive squares in only one way, i.e., 20611600 + 8054244 = 4540^2 + 2838^2 .

It is a super-2 number, since 2×28665844² = 1643461224464672, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28665844.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3583227 + ... + 3583234.

Almost surely, 2^28665844 is an apocalyptic number.

It is an amenable number.

28665844 is a deficient number, since it is larger than the sum of its proper divisors (21499390).

28665844 is a wasteful number, since it uses less digits than its factorization.

28665844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7166465 (or 7166463 counting only the distinct ones).

The product of its digits is 368640, while the sum is 43.

The square root of 28665844 is about 5354.0493087008. The cubic root of 28665844 is about 306.0470829057.

The spelling of 28665844 in words is "twenty-eight million, six hundred sixty-five thousand, eight hundred forty-four".