28431201 has 16 divisors (see below), whose sum is σ = 40089600. Its totient is φ = 17872848.

The previous prime is 28431187. The next prime is 28431209. The reversal of 28431201 is 10213482.

It is not a de Polignac number, because 28431201 - 2¹¹ = 28429153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28431209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12580 + ... + 14666.

It is an arithmetic number, because the mean of its divisors is an integer number (2505600).

Almost surely, 2^28431201 is an apocalyptic number.

It is an amenable number.

28431201 is a deficient number, since it is larger than the sum of its proper divisors (11658399).

28431201 is a wasteful number, since it uses less digits than its factorization.

28431201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2348.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 28431201 is about 5332.0916158671. The cubic root of 28431201 is about 305.2097491199.

Adding to 28431201 its reverse (10213482), we get a palindrome (38644683).

The spelling of 28431201 in words is "twenty-eight million, four hundred thirty-one thousand, two hundred one".