28136811 has 8 divisors (see below), whose sum is σ = 37650384. Its totient is φ = 18690560.

The previous prime is 28136807. The next prime is 28136813. The reversal of 28136811 is 11863182.

28136811 is nontrivially palindromic in base 2.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28136811 - 2² = 28136807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28136813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15846 + ... + 17531.

It is an arithmetic number, because the mean of its divisors is an integer number (4706298).

Almost surely, 2^28136811 is an apocalyptic number.

28136811 is a deficient number, since it is larger than the sum of its proper divisors (9513573).

28136811 is a wasteful number, since it uses less digits than its factorization.

28136811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33661.

The product of its digits is 2304, while the sum is 30.

The square root of 28136811 is about 5304.4142937746. The cubic root of 28136811 is about 304.1526638286.

Adding to 28136811 its reverse (11863182), we get a palindrome (39999993).

The spelling of 28136811 in words is "twenty-eight million, one hundred thirty-six thousand, eight hundred eleven".