28006441 has 4 divisors (see below), whose sum is σ = 28343952. Its totient is φ = 27668932.

The previous prime is 28006439. The next prime is 28006453. The reversal of 28006441 is 14460082.

28006441 = T₅₄ + T₅₅ + ... + T₅₅₁.

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 28006441 - 2¹ = 28006439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28003441) 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, 168631 + ... + 168796.

It is an arithmetic number, because the mean of its divisors is an integer number (7085988).

Almost surely, 2^28006441 is an apocalyptic number.

It is an amenable number.

28006441 is a deficient number, since it is larger than the sum of its proper divisors (337511).

28006441 is an equidigital number, since it uses as much as digits as its factorization.

28006441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337510.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 28006441 is about 5292.1112044249. Note that the first 3 decimals coincide. The cubic root of 28006441 is about 303.6821795328.

The spelling of 28006441 in words is "twenty-eight million, six thousand, four hundred forty-one".