28191829 has 2 divisors, whose sum is σ = 28191830. Its totient is φ = 28191828.

The previous prime is 28191773. The next prime is 28191847. The reversal of 28191829 is 92819182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25704900 + 2486929 = 5070^2 + 1577^2 .

It is a cyclic number.

It is not a de Polignac number, because 28191829 - 2¹⁷ = 28060757 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28191791 and 28191800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28191329) 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 as a sum of consecutive naturals, namely, 14095914 + 14095915.

It is an arithmetic number, because the mean of its divisors is an integer number (14095915).

Almost surely, 2^28191829 is an apocalyptic number.

It is an amenable number.

28191829 is a deficient number, since it is larger than the sum of its proper divisors (1).

28191829 is an equidigital number, since it uses as much as digits as its factorization.

28191829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 40.

The square root of 28191829 is about 5309.5978190443. The cubic root of 28191829 is about 304.3507788661.

The spelling of 28191829 in words is "twenty-eight million, one hundred ninety-one thousand, eight hundred twenty-nine".