28517075 has 18 divisors (see below), whose sum is σ = 37573116. Its totient is φ = 21466240.

The previous prime is 28517053. The next prime is 28517077. The reversal of 28517075 is 57071582.

It is not a de Polignac number, because 28517075 - 2⁸ = 28516819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28517077) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 5252 + ... + 9198.

Almost surely, 2^28517075 is an apocalyptic number.

28517075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28517075 is a deficient number, since it is larger than the sum of its proper divisors (9056041).

28517075 is a wasteful number, since it uses less digits than its factorization.

28517075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3991 (or 3969 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 28517075 is about 5340.1381068283. The cubic root of 28517075 is about 305.5167268689.

Subtracting from 28517075 its product of nonzero digits (19600), we obtain a triangular number (28497475 = T₇₅₄₉).

The spelling of 28517075 in words is "twenty-eight million, five hundred seventeen thousand, seventy-five".