28167229 has 4 divisors (see below), whose sum is σ = 28290460. Its totient is φ = 28044000.

The previous prime is 28167199. The next prime is 28167239. The reversal of 28167229 is 92276182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92276182 = 2 ⋅46138091.

It can be written as a sum of positive squares in 2 ways, for example, as 17264025 + 10903204 = 4155^2 + 3302^2 .

It is a cyclic number.

It is not a de Polignac number, because 28167229 - 2⁹ = 28166717 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 (28167239) 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, 61272 + ... + 61729.

It is an arithmetic number, because the mean of its divisors is an integer number (7072615).

Almost surely, 2^28167229 is an apocalyptic number.

It is an amenable number.

28167229 is a deficient number, since it is larger than the sum of its proper divisors (123231).

28167229 is a wasteful number, since it uses less digits than its factorization.

28167229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123230.

The product of its digits is 24192, while the sum is 37.

The square root of 28167229 is about 5307.2807538324. The cubic root of 28167229 is about 304.2622282920.

The spelling of 28167229 in words is "twenty-eight million, one hundred sixty-seven thousand, two hundred twenty-nine".