28211933 has 2 divisors, whose sum is σ = 28211934. Its totient is φ = 28211932.

The previous prime is 28211929. The next prime is 28211947. The reversal of 28211933 is 33911282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26030404 + 2181529 = 5102^2 + 1477^2 .

It is a cyclic number.

It is not a de Polignac number, because 28211933 - 2² = 28211929 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28211896 and 28211905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28211923) 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 as a sum of consecutive naturals, namely, 14105966 + 14105967.

It is an arithmetic number, because the mean of its divisors is an integer number (14105967).

Almost surely, 2^28211933 is an apocalyptic number.

It is an amenable number.

28211933 is a deficient number, since it is larger than the sum of its proper divisors (1).

28211933 is an equidigital number, since it uses as much as digits as its factorization.

28211933 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 28211933 is about 5311.4906570566. The cubic root of 28211933 is about 304.4231073198.

The spelling of 28211933 in words is "twenty-eight million, two hundred eleven thousand, nine hundred thirty-three".