28431185 has 24 divisors (see below), whose sum is σ = 36200808. Its totient is φ = 21427200.

The previous prime is 28431167. The next prime is 28431187. The reversal of 28431185 is 58113482.

It can be written as a sum of positive squares in 4 ways, for example, as 961 + 28430224 = 31^2 + 5332^2 .

It is not a de Polignac number, because 28431185 - 2⁸ = 28430929 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28431187) 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 23 ways as a sum of consecutive naturals, for example, 293057 + ... + 293153.

It is an arithmetic number, because the mean of its divisors is an integer number (1508367).

Almost surely, 2^28431185 is an apocalyptic number.

It is an amenable number.

28431185 is a deficient number, since it is larger than the sum of its proper divisors (7769623).

28431185 is an equidigital number, since it uses as much as digits as its factorization.

28431185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225 (or 194 counting only the distinct ones).

The product of its digits is 7680, while the sum is 32.

The square root of 28431185 is about 5332.0901155176. The cubic root of 28431185 is about 305.2096918664.

The spelling of 28431185 in words is "twenty-eight million, four hundred thirty-one thousand, one hundred eighty-five".