28243599 has 4 divisors (see below), whose sum is σ = 37658136. Its totient is φ = 18829064.

The previous prime is 28243597. The next prime is 28243601. The reversal of 28243599 is 99534282.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (28243597) and next prime (28243601).

It is a cyclic number.

It is not a de Polignac number, because 28243599 - 2¹ = 28243597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28243599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28243597) 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 3 ways as a sum of consecutive naturals, for example, 4707264 + ... + 4707269.

It is an arithmetic number, because the mean of its divisors is an integer number (9414534).

Almost surely, 2^28243599 is an apocalyptic number.

28243599 is a deficient number, since it is larger than the sum of its proper divisors (9414537).

28243599 is an equidigital number, since it uses as much as digits as its factorization.

28243599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9414536.

The product of its digits is 155520, while the sum is 42.

The square root of 28243599 is about 5314.4707168259. The cubic root of 28243599 is about 304.5369628960.

The spelling of 28243599 in words is "twenty-eight million, two hundred forty-three thousand, five hundred ninety-nine".