28643511 has 12 divisors (see below), whose sum is σ = 41177192. Its totient is φ = 17606208.

The previous prime is 28643471. The next prime is 28643519. The reversal of 28643511 is 11534682.

It is not a de Polignac number, because 28643511 - 2¹⁰ = 28642487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28643519) 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 11 ways as a sum of consecutive naturals, for example, 32995 + ... + 33851.

Almost surely, 2^28643511 is an apocalyptic number.

28643511 is a deficient number, since it is larger than the sum of its proper divisors (12533681).

28643511 is an frugal number, since it uses more digits than its factorization.

28643511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730 (or 873 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 28643511 is about 5351.9632846274. The cubic root of 28643511 is about 305.9675838189.

The spelling of 28643511 in words is "twenty-eight million, six hundred forty-three thousand, five hundred eleven".