28065973 has 4 divisors (see below), whose sum is σ = 30224908. Its totient is φ = 25907040.

The previous prime is 28065967. The next prime is 28065977. The reversal of 28065973 is 37956082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37956082 = 2 ⋅18978041.

It can be written as a sum of positive squares in 2 ways, for example, as 17156164 + 10909809 = 4142^2 + 3303^2 .

It is a cyclic number.

It is not a de Polignac number, because 28065973 - 2⁵ = 28065941 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 (28065977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1079448 + ... + 1079473.

It is an arithmetic number, because the mean of its divisors is an integer number (7556227).

Almost surely, 2^28065973 is an apocalyptic number.

It is an amenable number.

28065973 is a deficient number, since it is larger than the sum of its proper divisors (2158935).

28065973 is a wasteful number, since it uses less digits than its factorization.

28065973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158934.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 28065973 is about 5297.7328169699. The cubic root of 28065973 is about 303.8972016517.

The spelling of 28065973 in words is "twenty-eight million, sixty-five thousand, nine hundred seventy-three".