28521449 has 16 divisors (see below), whose sum is σ = 32901120. Its totient is φ = 24470160.

The previous prime is 28521443. The next prime is 28521497. The reversal of 28521449 is 94412582.

It is not a de Polignac number, because 28521449 - 2⁸ = 28521193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28521443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19274 + ... + 20700.

It is an arithmetic number, because the mean of its divisors is an integer number (2056320).

Almost surely, 2^28521449 is an apocalyptic number.

It is an amenable number.

28521449 is a deficient number, since it is larger than the sum of its proper divisors (4379671).

28521449 is a wasteful number, since it uses less digits than its factorization.

28521449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540.

The product of its digits is 23040, while the sum is 35.

The square root of 28521449 is about 5340.5476310955. The cubic root of 28521449 is about 305.5323463045.

The spelling of 28521449 in words is "twenty-eight million, five hundred twenty-one thousand, four hundred forty-nine".