28321201 has 16 divisors (see below), whose sum is σ = 31026240. Its totient is φ = 25745920.

The previous prime is 28321199. The next prime is 28321217. The reversal of 28321201 is 10212382.

It is a cyclic number.

It is not a de Polignac number, because 28321201 - 2¹ = 28321199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28321301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124650 + ... + 124876.

It is an arithmetic number, because the mean of its divisors is an integer number (1939140).

Almost surely, 2^28321201 is an apocalyptic number.

It is an amenable number.

28321201 is a deficient number, since it is larger than the sum of its proper divisors (2705039).

28321201 is a wasteful number, since it uses less digits than its factorization.

28321201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 28321201 is about 5321.7667179237. The cubic root of 28321201 is about 304.8156226851.

Adding to 28321201 its reverse (10212382), we get a palindrome (38533583).

The spelling of 28321201 in words is "twenty-eight million, three hundred twenty-one thousand, two hundred one".