28261275 has 24 divisors (see below), whose sum is σ = 53401344. Its totient is φ = 12919200.

The previous prime is 28261267. The next prime is 28261279. The reversal of 28261275 is 57216282.

It is not a de Polignac number, because 28261275 - 2³ = 28261267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28261279) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 26391 + ... + 27440.

It is an arithmetic number, because the mean of its divisors is an integer number (2225056).

Almost surely, 2^28261275 is an apocalyptic number.

28261275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28261275 is a deficient number, since it is larger than the sum of its proper divisors (25140069).

28261275 is a wasteful number, since it uses less digits than its factorization.

28261275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53851 (or 53846 counting only the distinct ones).

The product of its digits is 13440, while the sum is 33.

The square root of 28261275 is about 5316.1334633359. The cubic root of 28261275 is about 304.6004802117.

The spelling of 28261275 in words is "twenty-eight million, two hundred sixty-one thousand, two hundred seventy-five".