28281475 has 6 divisors (see below), whose sum is σ = 35069060. Its totient is φ = 22625160.

The previous prime is 28281457. The next prime is 28281493. The reversal of 28281475 is 57418282.

It is an interprime number because it is at equal distance from previous prime (28281457) and next prime (28281493).

It is not a de Polignac number, because 28281475 - 2¹³ = 28273283 is a prime.

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 5 ways as a sum of consecutive naturals, for example, 565605 + ... + 565654.

Almost surely, 2^28281475 is an apocalyptic number.

28281475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28281475 is a deficient number, since it is larger than the sum of its proper divisors (6787585).

28281475 is a wasteful number, since it uses less digits than its factorization.

28281475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131269 (or 1131264 counting only the distinct ones).

The product of its digits is 35840, while the sum is 37.

The square root of 28281475 is about 5318.0330010258. The cubic root of 28281475 is about 304.6730349039.

The spelling of 28281475 in words is "twenty-eight million, two hundred eighty-one thousand, four hundred seventy-five".