28924447 has 2 divisors, whose sum is σ = 28924448. Its totient is φ = 28924446.

The previous prime is 28924381. The next prime is 28924459. The reversal of 28924447 is 74442982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28924447 - 2¹⁵ = 28891679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28924747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14462223 + 14462224.

It is an arithmetic number, because the mean of its divisors is an integer number (14462224).

Almost surely, 2^28924447 is an apocalyptic number.

28924447 is a deficient number, since it is larger than the sum of its proper divisors (1).

28924447 is an equidigital number, since it uses as much as digits as its factorization.

28924447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 40.

The square root of 28924447 is about 5378.1453122801. The cubic root of 28924447 is about 306.9646427678.

The spelling of 28924447 in words is "twenty-eight million, nine hundred twenty-four thousand, four hundred forty-seven".