28085471 has 4 divisors (see below), whose sum is σ = 28113744. Its totient is φ = 28057200.

The previous prime is 28085459. The next prime is 28085489. The reversal of 28085471 is 17458082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28085471 - 2¹⁰ = 28084447 is a prime.

It is a super-3 number, since 3×28085471³ (a number of 23 digits) contains 333 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 (28085441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12590 + ... + 14651.

It is an arithmetic number, because the mean of its divisors is an integer number (7028436).

Almost surely, 2^28085471 is an apocalyptic number.

28085471 is a deficient number, since it is larger than the sum of its proper divisors (28273).

28085471 is a wasteful number, since it uses less digits than its factorization.

28085471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28272.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 28085471 is about 5299.5727186255. The cubic root of 28085471 is about 303.9675598752.

The spelling of 28085471 in words is "twenty-eight million, eighty-five thousand, four hundred seventy-one".