28727285 has 8 divisors (see below), whose sum is σ = 34508376. Its totient is φ = 22958080.

The previous prime is 28727267. The next prime is 28727287. The reversal of 28727285 is 58272782.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1874161 + 26853124 = 1369^2 + 5182^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28727285 - 2⁸ = 28727029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28727287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3725 + ... + 8445.

It is an arithmetic number, because the mean of its divisors is an integer number (4313547).

Almost surely, 2^28727285 is an apocalyptic number.

It is an amenable number.

28727285 is a deficient number, since it is larger than the sum of its proper divisors (5781091).

28727285 is a wasteful number, since it uses less digits than its factorization.

28727285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5943.

The product of its digits is 125440, while the sum is 41.

The square root of 28727285 is about 5359.7840441570. The cubic root of 28727285 is about 306.2655824363.

It can be divided in two parts, 287 and 27285, that added together give a palindrome (27572).

The spelling of 28727285 in words is "twenty-eight million, seven hundred twenty-seven thousand, two hundred eighty-five".