28117045 has 32 divisors (see below), whose sum is σ = 38361600. Its totient is φ = 19607040.

The previous prime is 28117039. The next prime is 28117049. The reversal of 28117045 is 54071182.

It is not a de Polignac number, because 28117045 - 2⁹ = 28116533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28117049) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 188631 + ... + 188779.

It is an arithmetic number, because the mean of its divisors is an integer number (1198800).

Almost surely, 2^28117045 is an apocalyptic number.

It is an amenable number.

28117045 is a deficient number, since it is larger than the sum of its proper divisors (10244555).

28117045 is a wasteful number, since it uses less digits than its factorization.

28117045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 28117045 is about 5302.5508012654. The cubic root of 28117045 is about 304.0814251243.

The spelling of 28117045 in words is "twenty-eight million, one hundred seventeen thousand, forty-five".