28147447 has 2 divisors, whose sum is σ = 28147448. Its totient is φ = 28147446.

The previous prime is 28147439. The next prime is 28147451. The reversal of 28147447 is 74474182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28147447 - 2³ = 28147439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28147547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14073723 + 14073724.

It is an arithmetic number, because the mean of its divisors is an integer number (14073724).

Almost surely, 2^28147447 is an apocalyptic number.

28147447 is a deficient number, since it is larger than the sum of its proper divisors (1).

28147447 is an equidigital number, since it uses as much as digits as its factorization.

28147447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50176, while the sum is 37.

The square root of 28147447 is about 5305.4167602555. The cubic root of 28147447 is about 304.1909832648.

The spelling of 28147447 in words is "twenty-eight million, one hundred forty-seven thousand, four hundred forty-seven".