28132005 has 16 divisors (see below), whose sum is σ = 49103424. Its totient is φ = 13639680.

The previous prime is 28131977. The next prime is 28132009. The reversal of 28132005 is 50023182.

It is not a de Polignac number, because 28132005 - 2¹² = 28127909 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28132009) 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, 85084 + ... + 85413.

It is an arithmetic number, because the mean of its divisors is an integer number (3068964).

Almost surely, 2^28132005 is an apocalyptic number.

It is an amenable number.

28132005 is a deficient number, since it is larger than the sum of its proper divisors (20971419).

28132005 is a wasteful number, since it uses less digits than its factorization.

28132005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170516.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 28132005 is about 5303.9612555146. The cubic root of 28132005 is about 304.1353455791.

Adding to 28132005 its reverse (50023182), we get a palindrome (78155187).

The spelling of 28132005 in words is "twenty-eight million, one hundred thirty-two thousand, five".