28212719 has 2 divisors, whose sum is σ = 28212720. Its totient is φ = 28212718.

The previous prime is 28212713. The next prime is 28212721. The reversal of 28212719 is 91721282.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28212719 - 2¹⁶ = 28147183 is a prime.

It is a super-2 number, since 2×28212719² = 1591915026745922, which contains 22 as substring.

Together with 28212721, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28212713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14106359 + 14106360.

It is an arithmetic number, because the mean of its divisors is an integer number (14106360).

Almost surely, 2^28212719 is an apocalyptic number.

28212719 is a deficient number, since it is larger than the sum of its proper divisors (1).

28212719 is an equidigital number, since it uses as much as digits as its factorization.

28212719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 32.

The square root of 28212719 is about 5311.5646470696. The cubic root of 28212719 is about 304.4259344254.

The spelling of 28212719 in words is "twenty-eight million, two hundred twelve thousand, seven hundred nineteen".