28287975 has 12 divisors (see below), whose sum is σ = 46769576. Its totient is φ = 15086880.

The previous prime is 28287929. The next prime is 28288019. The reversal of 28287975 is 57978282.

It is not a de Polignac number, because 28287975 - 2⁹ = 28287463 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 (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 188512 + ... + 188661.

Almost surely, 2^28287975 is an apocalyptic number.

28287975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28287975 is a deficient number, since it is larger than the sum of its proper divisors (18481601).

28287975 is a wasteful number, since it uses less digits than its factorization.

28287975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377186 (or 377181 counting only the distinct ones).

The product of its digits is 564480, while the sum is 48.

The square root of 28287975 is about 5318.6440941278. The cubic root of 28287975 is about 304.6963743635.

The spelling of 28287975 in words is "twenty-eight million, two hundred eighty-seven thousand, nine hundred seventy-five".