28006943 has 4 divisors (see below), whose sum is σ = 28018800. Its totient is φ = 27995088.

The previous prime is 28006897. The next prime is 28006967. The reversal of 28006943 is 34960082.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 34960082 = 2 ⋅17480041.

It is a cyclic number.

It is not a de Polignac number, because 28006943 - 2⁶ = 28006879 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 (28006243) 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, 1043 + ... + 7556.

It is an arithmetic number, because the mean of its divisors is an integer number (7004700).

Almost surely, 2^28006943 is an apocalyptic number.

28006943 is a deficient number, since it is larger than the sum of its proper divisors (11857).

28006943 is an equidigital number, since it uses as much as digits as its factorization.

28006943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11856.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 28006943 is about 5292.1586332989. The cubic root of 28006943 is about 303.6839939672.

The spelling of 28006943 in words is "twenty-eight million, six thousand, nine hundred forty-three".