28660005 has 24 divisors (see below), whose sum is σ = 54194400. Its totient is φ = 13895520.

The previous prime is 28660003. The next prime is 28660031. The reversal of 28660005 is 50006682.

It is not a de Polignac number, because 28660005 - 2¹ = 28660003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28660003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28455 + ... + 29444.

It is an arithmetic number, because the mean of its divisors is an integer number (2258100).

Almost surely, 2^28660005 is an apocalyptic number.

It is an amenable number.

28660005 is a deficient number, since it is larger than the sum of its proper divisors (25534395).

28660005 is a wasteful number, since it uses less digits than its factorization.

28660005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57921 (or 57918 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28660005 is about 5353.5039927136. The cubic root of 28660005 is about 306.0263017249.

Adding to 28660005 its reverse (50006682), we get a palindrome (78666687).

The spelling of 28660005 in words is "twenty-eight million, six hundred sixty thousand, five".