28917975 has 12 divisors (see below), whose sum is σ = 47811176. Its totient is φ = 15422880.

The previous prime is 28917953. The next prime is 28918031. The reversal of 28917975 is 57971982.

It is not a de Polignac number, because 28917975 - 2⁸ = 28917719 is a prime.

It is a Duffinian number.

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 11 ways as a sum of consecutive naturals, for example, 192712 + ... + 192861.

Almost surely, 2^28917975 is an apocalyptic number.

28917975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28917975 is a deficient number, since it is larger than the sum of its proper divisors (18893201).

28917975 is a wasteful number, since it uses less digits than its factorization.

28917975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385586 (or 385581 counting only the distinct ones).

The product of its digits is 317520, while the sum is 48.

The square root of 28917975 is about 5377.5435842027. The cubic root of 28917975 is about 306.9417460654.

It can be divided in two parts, 28917 and 975, that added together give a palindrome (29892).

The spelling of 28917975 in words is "twenty-eight million, nine hundred seventeen thousand, nine hundred seventy-five".