28004073 has 4 divisors (see below), whose sum is σ = 37338768. Its totient is φ = 18669380.

The previous prime is 28004069. The next prime is 28004089. The reversal of 28004073 is 37040082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28004073 - 2² = 28004069 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28004003) 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, 4667343 + ... + 4667348.

It is an arithmetic number, because the mean of its divisors is an integer number (9334692).

Almost surely, 2^28004073 is an apocalyptic number.

It is an amenable number.

28004073 is a deficient number, since it is larger than the sum of its proper divisors (9334695).

28004073 is an equidigital number, since it uses as much as digits as its factorization.

28004073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9334694.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 28004073 is about 5291.8874704589. The cubic root of 28004073 is about 303.6736203152.

The spelling of 28004073 in words is "twenty-eight million, four thousand, seventy-three".