28417281 has 24 divisors (see below), whose sum is σ = 39980160. Its totient is φ = 17944416.

The previous prime is 28417271. The next prime is 28417283. The reversal of 28417281 is 18271482.

It is a happy number.

It is not a de Polignac number, because 28417281 - 2¹⁰ = 28416257 is a prime.

It is a super-2 number, since 2×28417281² = 1615083718865922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28417283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 260655 + ... + 260763.

It is an arithmetic number, because the mean of its divisors is an integer number (1665840).

Almost surely, 2^28417281 is an apocalyptic number.

It is an amenable number.

28417281 is a deficient number, since it is larger than the sum of its proper divisors (11562879).

28417281 is a wasteful number, since it uses less digits than its factorization.

28417281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 202 counting only the distinct ones).

The product of its digits is 7168, while the sum is 33.

The square root of 28417281 is about 5330.7861521543. The cubic root of 28417281 is about 305.1599304569.

The spelling of 28417281 in words is "twenty-eight million, four hundred seventeen thousand, two hundred eighty-one".