28707205 has 8 divisors (see below), whose sum is σ = 34480152. Its totient is φ = 22944768.

The previous prime is 28707179. The next prime is 28707229. The reversal of 28707205 is 50270782.

It can be written as a sum of positive squares in 4 ways, for example, as 638401 + 28068804 = 799^2 + 5298^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28707205 - 2²¹ = 26610053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 5917 + ... + 9613.

It is an arithmetic number, because the mean of its divisors is an integer number (4310019).

Almost surely, 2^28707205 is an apocalyptic number.

It is an amenable number.

28707205 is a deficient number, since it is larger than the sum of its proper divisors (5772947).

28707205 is a wasteful number, since it uses less digits than its factorization.

28707205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5255.

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 28707205 is about 5357.9105069047. The cubic root of 28707205 is about 306.1942072457.

Adding to 28707205 its reverse (50270782), we get a palindrome (78977987).

The spelling of 28707205 in words is "twenty-eight million, seven hundred seven thousand, two hundred five".