28730243 has 4 divisors (see below), whose sum is σ = 29979408. Its totient is φ = 27481080.

The previous prime is 28730237. The next prime is 28730263. The reversal of 28730243 is 34203782.

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

It is a cyclic number.

It is not a de Polignac number, because 28730243 - 2¹² = 28726147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28730263) 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, 624548 + ... + 624593.

It is an arithmetic number, because the mean of its divisors is an integer number (7494852).

Almost surely, 2^28730243 is an apocalyptic number.

28730243 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28730243 is a deficient number, since it is larger than the sum of its proper divisors (1249165).

28730243 is a wasteful number, since it uses less digits than its factorization.

28730243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249164.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 28730243 is about 5360.0599810077. The cubic root of 28730243 is about 306.2760939588.

The spelling of 28730243 in words is "twenty-eight million, seven hundred thirty thousand, two hundred forty-three".