28813271 has 4 divisors (see below), whose sum is σ = 28831512. Its totient is φ = 28795032.

The previous prime is 28813261. The next prime is 28813297. The reversal of 28813271 is 17231882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17231882 = 2 ⋅8615941.

It is a cyclic number.

It is not a de Polignac number, because 28813271 - 2¹⁰ = 28812247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28813241) 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, 6500 + ... + 9993.

It is an arithmetic number, because the mean of its divisors is an integer number (7207878).

Almost surely, 2^28813271 is an apocalyptic number.

28813271 is a deficient number, since it is larger than the sum of its proper divisors (18241).

28813271 is a wasteful number, since it uses less digits than its factorization.

28813271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18240.

The product of its digits is 5376, while the sum is 32.

The square root of 28813271 is about 5367.7994560155. The cubic root of 28813271 is about 306.5708476371.

The spelling of 28813271 in words is "twenty-eight million, eight hundred thirteen thousand, two hundred seventy-one".