28005275 has 6 divisors (see below), whose sum is σ = 34726572. Its totient is φ = 22404200.

The previous prime is 28005269. The next prime is 28005317. The reversal of 28005275 is 57250082.

It is not a de Polignac number, because 28005275 - 2¹² = 28001179 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 560081 + ... + 560130.

It is an arithmetic number, because the mean of its divisors is an integer number (5787762).

Almost surely, 2^28005275 is an apocalyptic number.

28005275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28005275 is a deficient number, since it is larger than the sum of its proper divisors (6721297).

28005275 is a wasteful number, since it uses less digits than its factorization.

28005275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120221 (or 1120216 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 28005275 is about 5292.0010393045. The cubic root of 28005275 is about 303.6779650459.

The spelling of 28005275 in words is "twenty-eight million, five thousand, two hundred seventy-five".