28186275 has 24 divisors (see below), whose sum is σ = 50187760. Its totient is φ = 13875840.

The previous prime is 28186271. The next prime is 28186303. The reversal of 28186275 is 57268182.

It is not a de Polignac number, because 28186275 - 2² = 28186271 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (28186271) by changing a digit.

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, 13480 + ... + 15429.

Almost surely, 2^28186275 is an apocalyptic number.

28186275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28186275 is a deficient number, since it is larger than the sum of its proper divisors (22001485).

28186275 is a wasteful number, since it uses less digits than its factorization.

28186275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28935 (or 28930 counting only the distinct ones).

The product of its digits is 53760, while the sum is 39.

The square root of 28186275 is about 5309.0747781511. The cubic root of 28186275 is about 304.3307910977.

The spelling of 28186275 in words is "twenty-eight million, one hundred eighty-six thousand, two hundred seventy-five".