28775843 has 4 divisors (see below), whose sum is σ = 29704128. Its totient is φ = 27847560.

The previous prime is 28775827. The next prime is 28775863. The reversal of 28775843 is 34857782.

It is a happy number.

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 28775843 - 2⁴ = 28775827 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28775794 and 28775803.

It is not an unprimeable number, because it can be changed into a prime (28775863) 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, 464096 + ... + 464157.

It is an arithmetic number, because the mean of its divisors is an integer number (7426032).

Almost surely, 2^28775843 is an apocalyptic number.

28775843 is a deficient number, since it is larger than the sum of its proper divisors (928285).

28775843 is an equidigital number, since it uses as much as digits as its factorization.

28775843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928284.

The product of its digits is 376320, while the sum is 44.

The square root of 28775843 is about 5364.3119782503. The cubic root of 28775843 is about 306.4380464984.

The spelling of 28775843 in words is "twenty-eight million, seven hundred seventy-five thousand, eight hundred forty-three".