28004071 has 4 divisors (see below), whose sum is σ = 28019232. Its totient is φ = 27988912.

The previous prime is 28004069. The next prime is 28004089. The reversal of 28004071 is 17040082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17040082 = 2 ⋅8520041.

It is a cyclic number.

It is not a de Polignac number, because 28004071 - 2¹ = 28004069 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28004021) 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, 4351 + ... + 8656.

It is an arithmetic number, because the mean of its divisors is an integer number (7004808).

Almost surely, 2^28004071 is an apocalyptic number.

28004071 is a deficient number, since it is larger than the sum of its proper divisors (15161).

28004071 is a wasteful number, since it uses less digits than its factorization.

28004071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15160.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 28004071 is about 5291.8872814904. The cubic root of 28004071 is about 303.6736130859.

The spelling of 28004071 in words is "twenty-eight million, four thousand, seventy-one".