28028447 has 2 divisors, whose sum is σ = 28028448. Its totient is φ = 28028446.

The previous prime is 28028443. The next prime is 28028449. The reversal of 28028447 is 74482082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28028447 - 2² = 28028443 is a prime.

Together with 28028449, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28028443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14014223 + 14014224.

It is an arithmetic number, because the mean of its divisors is an integer number (14014224).

Almost surely, 2^28028447 is an apocalyptic number.

28028447 is a deficient number, since it is larger than the sum of its proper divisors (1).

28028447 is an equidigital number, since it uses as much as digits as its factorization.

28028447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28672, while the sum is 35.

The square root of 28028447 is about 5294.1899285915. The cubic root of 28028447 is about 303.7616979130.

The spelling of 28028447 in words is "twenty-eight million, twenty-eight thousand, four hundred forty-seven".