28900447 has 2 divisors, whose sum is σ = 28900448. Its totient is φ = 28900446.

The previous prime is 28900439. The next prime is 28900477. The reversal of 28900447 is 74400982.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28900447 - 2³ = 28900439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28900427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14450223 + 14450224.

It is an arithmetic number, because the mean of its divisors is an integer number (14450224).

Almost surely, 2^28900447 is an apocalyptic number.

28900447 is a deficient number, since it is larger than the sum of its proper divisors (1).

28900447 is an equidigital number, since it uses as much as digits as its factorization.

28900447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 28900447 is about 5375.9135967759. The cubic root of 28900447 is about 306.8797181826.

The spelling of 28900447 in words is "twenty-eight million, nine hundred thousand, four hundred forty-seven".