28771845 has 16 divisors (see below), whose sum is σ = 46904832. Its totient is φ = 15055040.

The previous prime is 28771819. The next prime is 28771889. The reversal of 28771845 is 54817782.

It is not a de Polignac number, because 28771845 - 2⁹ = 28771333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28771797 and 28771806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17301 + ... + 18890.

It is an arithmetic number, because the mean of its divisors is an integer number (2931552).

Almost surely, 2^28771845 is an apocalyptic number.

It is an amenable number.

28771845 is a deficient number, since it is larger than the sum of its proper divisors (18132987).

28771845 is a wasteful number, since it uses less digits than its factorization.

28771845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36252.

The product of its digits is 125440, while the sum is 42.

The square root of 28771845 is about 5363.9393173301. The cubic root of 28771845 is about 306.4238540841.

The spelling of 28771845 in words is "twenty-eight million, seven hundred seventy-one thousand, eight hundred forty-five".