28004273 has 4 divisors (see below), whose sum is σ = 30550128. Its totient is φ = 25458420.

The previous prime is 28004269. The next prime is 28004279. The reversal of 28004273 is 37240082.

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 28004273 - 2² = 28004269 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28004279) 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, 1272911 + ... + 1272932.

It is an arithmetic number, because the mean of its divisors is an integer number (7637532).

Almost surely, 2^28004273 is an apocalyptic number.

It is an amenable number.

28004273 is a deficient number, since it is larger than the sum of its proper divisors (2545855).

28004273 is a wasteful number, since it uses less digits than its factorization.

28004273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2545854.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 28004273 is about 5291.9063672745. The cubic root of 28004273 is about 303.6743432408.

The spelling of 28004273 in words is "twenty-eight million, four thousand, two hundred seventy-three".