28217375 has 24 divisors (see below), whose sum is σ = 37411920. Its totient is φ = 21189600.

The previous prime is 28217363. The next prime is 28217383. The reversal of 28217375 is 57371282.

It is not a de Polignac number, because 28217375 - 2¹² = 28213279 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 258821 + ... + 258929.

It is an arithmetic number, because the mean of its divisors is an integer number (1558830).

Almost surely, 2^28217375 is an apocalyptic number.

28217375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28217375 is a deficient number, since it is larger than the sum of its proper divisors (9194545).

28217375 is an equidigital number, since it uses as much as digits as its factorization.

28217375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 133 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 28217375 is about 5312.0029179209. The cubic root of 28217375 is about 304.4426801726.

The spelling of 28217375 in words is "twenty-eight million, two hundred seventeen thousand, three hundred seventy-five".