28667843 has 4 divisors (see below), whose sum is σ = 28681248. Its totient is φ = 28654440.

The previous prime is 28667833. The next prime is 28667851. The reversal of 28667843 is 34876682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34876682 = 2 ⋅17438341.

It is a cyclic number.

It is not a de Polignac number, because 28667843 - 2¹⁶ = 28602307 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28667794 and 28667803.

It is not an unprimeable number, because it can be changed into a prime (28667813) 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, 2696 + ... + 8037.

It is an arithmetic number, because the mean of its divisors is an integer number (7170312).

Almost surely, 2^28667843 is an apocalyptic number.

28667843 is a deficient number, since it is larger than the sum of its proper divisors (13405).

28667843 is a wasteful number, since it uses less digits than its factorization.

28667843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13404.

The product of its digits is 387072, while the sum is 44.

The square root of 28667843 is about 5354.2359865811. The cubic root of 28667843 is about 306.0541967598.

The spelling of 28667843 in words is "twenty-eight million, six hundred sixty-seven thousand, eight hundred forty-three".