28250443 has 4 divisors (see below), whose sum is σ = 30423568. Its totient is φ = 26077320.

The previous prime is 28250429. The next prime is 28250449. The reversal of 28250443 is 34405282.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28250443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28250449) 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 3 ways as a sum of consecutive naturals, for example, 1086543 + ... + 1086568.

It is an arithmetic number, because the mean of its divisors is an integer number (7605892).

Almost surely, 2^28250443 is an apocalyptic number.

28250443 is a deficient number, since it is larger than the sum of its proper divisors (2173125).

28250443 is a wasteful number, since it uses less digits than its factorization.

28250443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2173124.

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 28250443 is about 5315.1145801384. The cubic root of 28250443 is about 304.5615594148.

The spelling of 28250443 in words is "twenty-eight million, two hundred fifty thousand, four hundred forty-three".