28201605 has 16 divisors (see below), whose sum is σ = 47497920. Its totient is φ = 14249088.

The previous prime is 28201603. The next prime is 28201609. The reversal of 28201605 is 50610282.

28201605 is nontrivially palindromic in base 12.

It is not a de Polignac number, because 28201605 - 2¹ = 28201603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28201603) 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, 49192 + ... + 49761.

It is an arithmetic number, because the mean of its divisors is an integer number (2968620).

Almost surely, 2^28201605 is an apocalyptic number.

It is an amenable number.

28201605 is a deficient number, since it is larger than the sum of its proper divisors (19296315).

28201605 is a wasteful number, since it uses less digits than its factorization.

28201605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98980.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 28201605 is about 5310.5183362832. The cubic root of 28201605 is about 304.3859544172.

Adding to 28201605 its reverse (50610282), we get a palindrome (78811887).

The spelling of 28201605 in words is "twenty-eight million, two hundred one thousand, six hundred five".