28662005 has 16 divisors (see below), whose sum is σ = 35996400. Its totient is φ = 21880320.

The previous prime is 28662001. The next prime is 28662019. The reversal of 28662005 is 50026682.

It can be written as a sum of positive squares in 8 ways, for example, as 508369 + 28153636 = 713^2 + 5306^2 .

It is not a de Polignac number, because 28662005 - 2² = 28662001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28662001) 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, 11795 + ... + 14015.

It is an arithmetic number, because the mean of its divisors is an integer number (2249775).

Almost surely, 2^28662005 is an apocalyptic number.

It is an amenable number.

28662005 is a deficient number, since it is larger than the sum of its proper divisors (7334395).

28662005 is a wasteful number, since it uses less digits than its factorization.

28662005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 28662005 is about 5353.6907830019. The cubic root of 28662005 is about 306.0334201043.

Adding to 28662005 its reverse (50026682), we get a palindrome (78688687).

The spelling of 28662005 in words is "twenty-eight million, six hundred sixty-two thousand, five".