28231201 has 4 divisors (see below), whose sum is σ = 28495152. Its totient is φ = 27967252.

The previous prime is 28231163. The next prime is 28231213. The reversal of 28231201 is 10213282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10213282 = 2 ⋅5106641.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28231201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28231261) 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, 131815 + ... + 132028.

It is an arithmetic number, because the mean of its divisors is an integer number (7123788).

Almost surely, 2^28231201 is an apocalyptic number.

It is an amenable number.

28231201 is a deficient number, since it is larger than the sum of its proper divisors (263951).

28231201 is a wasteful number, since it uses less digits than its factorization.

28231201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263950.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 28231201 is about 5313.3041509027. The cubic root of 28231201 is about 304.4923958437.

Adding to 28231201 its reverse (10213282), we get a palindrome (38444483).

The spelling of 28231201 in words is "twenty-eight million, two hundred thirty-one thousand, two hundred one".