28988447 has 2 divisors, whose sum is σ = 28988448. Its totient is φ = 28988446.

The previous prime is 28988437. The next prime is 28988459. The reversal of 28988447 is 74488982.

28988447 is nontrivially palindromic in base 15.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28988447 - 2⁴ = 28988431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28988395 and 28988404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28988437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14494223 + 14494224.

It is an arithmetic number, because the mean of its divisors is an integer number (14494224).

Almost surely, 2^28988447 is an apocalyptic number.

28988447 is a deficient number, since it is larger than the sum of its proper divisors (1).

28988447 is an equidigital number, since it uses as much as digits as its factorization.

28988447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1032192, while the sum is 50.

The square root of 28988447 is about 5384.0920311599. The cubic root of 28988447 is about 307.1908789011.

The spelling of 28988447 in words is "twenty-eight million, nine hundred eighty-eight thousand, four hundred forty-seven".