28000305 has 48 divisors (see below), whose sum is σ = 50791104. Its totient is φ = 14256000.

The previous prime is 28000237. The next prime is 28000321. The reversal of 28000305 is 50300082.

It is not a de Polignac number, because 28000305 - 2¹⁰ = 27999281 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 111430 + ... + 111680.

It is an arithmetic number, because the mean of its divisors is an integer number (1058148).

Almost surely, 2^28000305 is an apocalyptic number.

It is an amenable number.

28000305 is a deficient number, since it is larger than the sum of its proper divisors (22790799).

28000305 is a wasteful number, since it uses less digits than its factorization.

28000305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 28000305 is about 5291.5314418418. The cubic root of 28000305 is about 303.6599997546.

Adding to 28000305 its reverse (50300082), we get a palindrome (78300387).

The spelling of 28000305 in words is "twenty-eight million, three hundred five", and thus it is an aban number.