28783219 has 2 divisors, whose sum is σ = 28783220. Its totient is φ = 28783218.

The previous prime is 28783217. The next prime is 28783301. The reversal of 28783219 is 91238782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28783219 - 2¹ = 28783217 is a prime.

It is a super-2 number, since 2×28783219² = 1656947392003922, which contains 22 as substring.

Together with 28783217, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28783217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14391609 + 14391610.

It is an arithmetic number, because the mean of its divisors is an integer number (14391610).

Almost surely, 2^28783219 is an apocalyptic number.

28783219 is a deficient number, since it is larger than the sum of its proper divisors (1).

28783219 is an equidigital number, since it uses as much as digits as its factorization.

28783219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 28783219 is about 5364.9994408201. Note that the first 3 decimals coincide. The cubic root of 28783219 is about 306.4642269527.

The spelling of 28783219 in words is "twenty-eight million, seven hundred eighty-three thousand, two hundred nineteen".