28447885 has 8 divisors (see below), whose sum is σ = 36145656. Its totient is φ = 21419520.

The previous prime is 28447847. The next prime is 28447889. The reversal of 28447885 is 58874482.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3076516 + 25371369 = 1754^2 + 5037^2 .

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

It is not a de Polignac number, because 28447885 - 2¹⁵ = 28415117 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 (28447889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167256 + ... + 167425.

It is an arithmetic number, because the mean of its divisors is an integer number (4518207).

Almost surely, 2^28447885 is an apocalyptic number.

It is an amenable number.

28447885 is a deficient number, since it is larger than the sum of its proper divisors (7697771).

28447885 is a wasteful number, since it uses less digits than its factorization.

28447885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334703.

The product of its digits is 573440, while the sum is 46.

The square root of 28447885 is about 5333.6558756635. The cubic root of 28447885 is about 305.2694385168.

The spelling of 28447885 in words is "twenty-eight million, four hundred forty-seven thousand, eight hundred eighty-five".