28043073 has 6 divisors (see below), whose sum is σ = 40506674. Its totient is φ = 18695376.

The previous prime is 28043053. The next prime is 28043117. The reversal of 28043073 is 37034082.

It can be written as a sum of positive squares in only one way, i.e., 22581504 + 5461569 = 4752^2 + 2337^2 .

It is not a de Polignac number, because 28043073 - 2⁹ = 28042561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28043033) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1557940 + ... + 1557957.

Almost surely, 2^28043073 is an apocalyptic number.

It is an amenable number.

28043073 is a deficient number, since it is larger than the sum of its proper divisors (12463601).

28043073 is a wasteful number, since it uses less digits than its factorization.

28043073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3115903 (or 3115900 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 28043073 is about 5295.5710740203. The cubic root of 28043073 is about 303.8145257421.

The spelling of 28043073 in words is "twenty-eight million, forty-three thousand, seventy-three".