28289271 has 8 divisors (see below), whose sum is σ = 39704320. Its totient is φ = 17866872.

The previous prime is 28289263. The next prime is 28289279. The reversal of 28289271 is 17298282.

It is an interprime number because it is at equal distance from previous prime (28289263) and next prime (28289279).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28289271 - 2³ = 28289263 is a prime.

It is a super-2 number, since 2×28289271² = 1600565707422882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28289279) 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 7 ways as a sum of consecutive naturals, for example, 248095 + ... + 248208.

It is an arithmetic number, because the mean of its divisors is an integer number (4963040).

Almost surely, 2^28289271 is an apocalyptic number.

28289271 is a deficient number, since it is larger than the sum of its proper divisors (11415049).

28289271 is a wasteful number, since it uses less digits than its factorization.

28289271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496325.

The product of its digits is 32256, while the sum is 39.

The square root of 28289271 is about 5318.7659282958. The cubic root of 28289271 is about 304.7010274651.

The spelling of 28289271 in words is "twenty-eight million, two hundred eighty-nine thousand, two hundred seventy-one".