28321005 has 16 divisors (see below), whose sum is σ = 45394560. Its totient is φ = 15077568.

The previous prime is 28320979. The next prime is 28321061. The reversal of 28321005 is 50012382.

It is not a de Polignac number, because 28321005 - 2⁸ = 28320749 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9304 + ... + 11966.

It is an arithmetic number, because the mean of its divisors is an integer number (2837160).

Almost surely, 2^28321005 is an apocalyptic number.

It is an amenable number.

28321005 is a deficient number, since it is larger than the sum of its proper divisors (17073555).

28321005 is a wasteful number, since it uses less digits than its factorization.

28321005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3380.

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

The square root of 28321005 is about 5321.7483029546. The cubic root of 28321005 is about 304.8149195134.

Adding to 28321005 its reverse (50012382), we get a palindrome (78333387).

The spelling of 28321005 in words is "twenty-eight million, three hundred twenty-one thousand, five".