28543385 has 16 divisors (see below), whose sum is σ = 37135056. Its totient is φ = 20936448.

The previous prime is 28543381. The next prime is 28543387. The reversal of 28543385 is 58334582.

It can be written as a sum of positive squares in 8 ways, for example, as 1721344 + 26822041 = 1312^2 + 5179^2 .

It is not a de Polignac number, because 28543385 - 2² = 28543381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28543381) 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 15 ways as a sum of consecutive naturals, for example, 8807 + ... + 11603.

It is an arithmetic number, because the mean of its divisors is an integer number (2320941).

Almost surely, 2^28543385 is an apocalyptic number.

It is an amenable number.

28543385 is a deficient number, since it is larger than the sum of its proper divisors (8591671).

28543385 is a wasteful number, since it uses less digits than its factorization.

28543385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2972.

The product of its digits is 115200, while the sum is 38.

The square root of 28543385 is about 5342.6009583348. The cubic root of 28543385 is about 305.6106550896.

The spelling of 28543385 in words is "twenty-eight million, five hundred forty-three thousand, three hundred eighty-five".