28268511 has 4 divisors (see below), whose sum is σ = 37691352. Its totient is φ = 18845672.

The previous prime is 28268507. The next prime is 28268519. The reversal of 28268511 is 11586282.

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 28268511 - 2² = 28268507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28268519) by changing a digit.

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, 4711416 + ... + 4711421.

It is an arithmetic number, because the mean of its divisors is an integer number (9422838).

Almost surely, 2^28268511 is an apocalyptic number.

28268511 is a deficient number, since it is larger than the sum of its proper divisors (9422841).

28268511 is an equidigital number, since it uses as much as digits as its factorization.

28268511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9422840.

The product of its digits is 7680, while the sum is 33.

The square root of 28268511 is about 5316.8139895994. The cubic root of 28268511 is about 304.6264745684.

The spelling of 28268511 in words is "twenty-eight million, two hundred sixty-eight thousand, five hundred eleven".