28004441 has 4 divisors (see below), whose sum is σ = 28120884. Its totient is φ = 27888000.

The previous prime is 28004437. The next prime is 28004447. The reversal of 28004441 is 14440082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15015625 + 12988816 = 3875^2 + 3604^2 .

It is a cyclic number.

It is not a de Polignac number, because 28004441 - 2² = 28004437 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28004447) 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, 57860 + ... + 58341.

It is an arithmetic number, because the mean of its divisors is an integer number (7030221).

Almost surely, 2^28004441 is an apocalyptic number.

It is an amenable number.

28004441 is a deficient number, since it is larger than the sum of its proper divisors (116443).

28004441 is a wasteful number, since it uses less digits than its factorization.

28004441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116442.

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 28004441 is about 5291.9222405474. The cubic root of 28004441 is about 303.6749504956.

The spelling of 28004441 in words is "twenty-eight million, four thousand, four hundred forty-one".