28288843 has 4 divisors (see below), whose sum is σ = 30860568. Its totient is φ = 25717120.

The previous prime is 28288829. The next prime is 28288859. The reversal of 28288843 is 34888282.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28288843 - 2⁹ = 28288331 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28288843.

It is not an unprimeable number, because it can be changed into a prime (28288823) 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, 1285846 + ... + 1285867.

It is an arithmetic number, because the mean of its divisors is an integer number (7715142).

Almost surely, 2^28288843 is an apocalyptic number.

28288843 is a deficient number, since it is larger than the sum of its proper divisors (2571725).

28288843 is a wasteful number, since it uses less digits than its factorization.

28288843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571724.

The product of its digits is 196608, while the sum is 43.

The square root of 28288843 is about 5318.7256932465. The cubic root of 28288843 is about 304.6994908084.

The spelling of 28288843 in words is "twenty-eight million, two hundred eighty-eight thousand, eight hundred forty-three".