28866645 has 16 divisors (see below), whose sum is σ = 51318720. Its totient is φ = 15395472.

The previous prime is 28866637. The next prime is 28866689. The reversal of 28866645 is 54666882.

It is not a de Polignac number, because 28866645 - 2³ = 28866637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28866645.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106779 + ... + 107048.

It is an arithmetic number, because the mean of its divisors is an integer number (3207420).

Almost surely, 2^28866645 is an apocalyptic number.

It is an amenable number.

28866645 is a deficient number, since it is larger than the sum of its proper divisors (22452075).

28866645 is a wasteful number, since it uses less digits than its factorization.

28866645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213841 (or 213835 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 28866645 is about 5372.7688392485. The cubic root of 28866645 is about 306.7600292032.

The spelling of 28866645 in words is "twenty-eight million, eight hundred sixty-six thousand, six hundred forty-five".