28248231 has 16 divisors (see below), whose sum is σ = 43251840. Its totient is φ = 16218720.

The previous prime is 28248179. The next prime is 28248239. The reversal of 28248231 is 13284282.

It is not a de Polignac number, because 28248231 - 2¹⁰ = 28247207 is a prime.

It is a super-2 number, since 2×28248231² = 1595925109258722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28248239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21900 + ... + 23153.

It is an arithmetic number, because the mean of its divisors is an integer number (2703240).

Almost surely, 2^28248231 is an apocalyptic number.

28248231 is a deficient number, since it is larger than the sum of its proper divisors (15003609).

28248231 is a wasteful number, since it uses less digits than its factorization.

28248231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45086.

The product of its digits is 6144, while the sum is 30.

The square root of 28248231 is about 5314.9064902404. The cubic root of 28248231 is about 304.5536101855.

The spelling of 28248231 in words is "twenty-eight million, two hundred forty-eight thousand, two hundred thirty-one".