28449438 has 16 divisors (see below), whose sum is σ = 57187200. Its totient is φ = 9435096.

The previous prime is 28449427. The next prime is 28449439. The reversal of 28449438 is 83494482.

It is a self number, because there is not a number n which added to its sum of digits gives 28449438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28449439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10720 + ... + 13107.

It is an arithmetic number, because the mean of its divisors is an integer number (3574200).

Almost surely, 2^28449438 is an apocalyptic number.

28449438 is an abundant number, since it is smaller than the sum of its proper divisors (28737762).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28449438 is a wasteful number, since it uses less digits than its factorization.

28449438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24031.

The product of its digits is 221184, while the sum is 42.

The square root of 28449438 is about 5333.8014586222. The cubic root of 28449438 is about 305.2749934091.

The spelling of 28449438 in words is "twenty-eight million, four hundred forty-nine thousand, four hundred thirty-eight".