28211838 has 32 divisors (see below), whose sum is σ = 58678560. Its totient is φ = 9031680.

The previous prime is 28211831. The next prime is 28211839. The reversal of 28211838 is 83811282.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28211799 and 28211808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28211831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48606 + ... + 49182.

It is an arithmetic number, because the mean of its divisors is an integer number (1833705).

Almost surely, 2^28211838 is an apocalyptic number.

28211838 is an abundant number, since it is smaller than the sum of its proper divisors (30466722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28211838 is a wasteful number, since it uses less digits than its factorization.

28211838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892.

The product of its digits is 6144, while the sum is 33.

The square root of 28211838 is about 5311.4817141736. The cubic root of 28211838 is about 304.4227656177.

The spelling of 28211838 in words is "twenty-eight million, two hundred eleven thousand, eight hundred thirty-eight".