28065743 has 4 divisors (see below), whose sum is σ = 28198968. Its totient is φ = 27932520.

The previous prime is 28065733. The next prime is 28065767. The reversal of 28065743 is 34756082.

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 28065743 - 2²⁰ = 27017167 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 (28065733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66296 + ... + 66717.

It is an arithmetic number, because the mean of its divisors is an integer number (7049742).

Almost surely, 2^28065743 is an apocalyptic number.

28065743 is a deficient number, since it is larger than the sum of its proper divisors (133225).

28065743 is a wasteful number, since it uses less digits than its factorization.

28065743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133224.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 28065743 is about 5297.7111095265. The cubic root of 28065743 is about 303.8963715059.

The spelling of 28065743 in words is "twenty-eight million, sixty-five thousand, seven hundred forty-three".