28560321 has 6 divisors (see below), whose sum is σ = 41253810. Its totient is φ = 19040208.

The previous prime is 28560251. The next prime is 28560353. The reversal of 28560321 is 12306582.

28560321 is a `hidden beast` number, since 285 + 60 + 321 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15492096 + 13068225 = 3936^2 + 3615^2 .

It is not a de Polignac number, because 28560321 - 2¹⁴ = 28543937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28560361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1586676 + ... + 1586693.

It is an arithmetic number, because the mean of its divisors is an integer number (6875635).

Almost surely, 2^28560321 is an apocalyptic number.

It is an amenable number.

28560321 is a deficient number, since it is larger than the sum of its proper divisors (12693489).

28560321 is a wasteful number, since it uses less digits than its factorization.

28560321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3173375 (or 3173372 counting only the distinct ones).

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

The square root of 28560321 is about 5344.1857190783. The cubic root of 28560321 is about 305.6710870567.

It can be divided in two parts, 285 and 60321, that added together give a palindrome (60606).

The spelling of 28560321 in words is "twenty-eight million, five hundred sixty thousand, three hundred twenty-one".