28222819 has 2 divisors, whose sum is σ = 28222820. Its totient is φ = 28222818.

The previous prime is 28222783. The next prime is 28222849. The reversal of 28222819 is 91822282.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28222819 - 2¹⁵ = 28190051 is a prime.

It is a super-2 number, since 2×28222819² = 1593055024613522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28222849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14111409 + 14111410.

It is an arithmetic number, because the mean of its divisors is an integer number (14111410).

Almost surely, 2^28222819 is an apocalyptic number.

28222819 is a deficient number, since it is larger than the sum of its proper divisors (1).

28222819 is an equidigital number, since it uses as much as digits as its factorization.

28222819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 34.

The square root of 28222819 is about 5312.5153176250. The cubic root of 28222819 is about 304.4622577010.

The spelling of 28222819 in words is "twenty-eight million, two hundred twenty-two thousand, eight hundred nineteen".