28160231 has 4 divisors (see below), whose sum is σ = 30720264. Its totient is φ = 25600200.

The previous prime is 28160221. The next prime is 28160239. The reversal of 28160231 is 13206182.

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 28160231 - 2¹⁰ = 28159207 is a prime.

It is a super-2 number, since 2×28160231² = 1585997219946722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28160197 and 28160206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28160239) 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, 1280000 + ... + 1280021.

It is an arithmetic number, because the mean of its divisors is an integer number (7680066).

Almost surely, 2^28160231 is an apocalyptic number.

28160231 is a deficient number, since it is larger than the sum of its proper divisors (2560033).

28160231 is a wasteful number, since it uses less digits than its factorization.

28160231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2560032.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 28160231 is about 5306.6214298742. The cubic root of 28160231 is about 304.2370287545.

The spelling of 28160231 in words is "twenty-eight million, one hundred sixty thousand, two hundred thirty-one".