28243895 has 4 divisors (see below), whose sum is σ = 33892680. Its totient is φ = 22595112.

The previous prime is 28243879. The next prime is 28243903. The reversal of 28243895 is 59834282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 59834282 = 2 ⋅29917141.

It is a cyclic number.

It is not a de Polignac number, because 28243895 - 2⁴ = 28243879 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2824385 + ... + 2824394.

It is an arithmetic number, because the mean of its divisors is an integer number (8473170).

Almost surely, 2^28243895 is an apocalyptic number.

28243895 is a deficient number, since it is larger than the sum of its proper divisors (5648785).

28243895 is an equidigital number, since it uses as much as digits as its factorization.

28243895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5648784.

The product of its digits is 138240, while the sum is 41.

The square root of 28243895 is about 5314.4985652458. The cubic root of 28243895 is about 304.5380267669.

The spelling of 28243895 in words is "twenty-eight million, two hundred forty-three thousand, eight hundred ninety-five".