28421047 has 2 divisors, whose sum is σ = 28421048. Its totient is φ = 28421046.

The previous prime is 28421039. The next prime is 28421051. The reversal of 28421047 is 74012482.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28421047 - 2³ = 28421039 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28421027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14210523 + 14210524.

It is an arithmetic number, because the mean of its divisors is an integer number (14210524).

Almost surely, 2^28421047 is an apocalyptic number.

28421047 is a deficient number, since it is larger than the sum of its proper divisors (1).

28421047 is an equidigital number, since it uses as much as digits as its factorization.

28421047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 28421047 is about 5331.1393716541. The cubic root of 28421047 is about 305.1734103008.

The spelling of 28421047 in words is "twenty-eight million, four hundred twenty-one thousand, forty-seven".