28449439 has 2 divisors, whose sum is σ = 28449440. Its totient is φ = 28449438.

The previous prime is 28449427. The next prime is 28449497. The reversal of 28449439 is 93494482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28449439 - 2¹⁵ = 28416671 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28449395 and 28449404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28449409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14224719 + 14224720.

It is an arithmetic number, because the mean of its divisors is an integer number (14224720).

Almost surely, 2^28449439 is an apocalyptic number.

28449439 is a deficient number, since it is larger than the sum of its proper divisors (1).

28449439 is an equidigital number, since it uses as much as digits as its factorization.

28449439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 43.

The square root of 28449439 is about 5333.8015523639. The cubic root of 28449439 is about 305.2749969859.

The spelling of 28449439 in words is "twenty-eight million, four hundred forty-nine thousand, four hundred thirty-nine".