28344285 has 12 divisors (see below), whose sum is σ = 49130172. Its totient is φ = 15116928.

The previous prime is 28344271. The next prime is 28344289. The reversal of 28344285 is 58244382.

It can be written as a sum of positive squares in 2 ways, for example, as 21734244 + 6610041 = 4662^2 + 2571^2 .

It is not a de Polignac number, because 28344285 - 2⁴ = 28344269 is a prime.

It is a super-2 number, since 2×28344285² = 1606796984322450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28344289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 314892 + ... + 314981.

It is an arithmetic number, because the mean of its divisors is an integer number (4094181).

Almost surely, 2^28344285 is an apocalyptic number.

It is an amenable number.

28344285 is a deficient number, since it is larger than the sum of its proper divisors (20785887).

28344285 is a wasteful number, since it uses less digits than its factorization.

28344285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629884 (or 629881 counting only the distinct ones).

The product of its digits is 61440, while the sum is 36.

The square root of 28344285 is about 5323.9351047886. The cubic root of 28344285 is about 304.8984164076.

The spelling of 28344285 in words is "twenty-eight million, three hundred forty-four thousand, two hundred eighty-five".