28630219 has 2 divisors, whose sum is σ = 28630220. Its totient is φ = 28630218.

The previous prime is 28630211. The next prime is 28630223. The reversal of 28630219 is 91203682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28630219 - 2³ = 28630211 is a prime.

It is a super-2 number, since 2×28630219² = 1639378879975922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28630211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14315109 + 14315110.

It is an arithmetic number, because the mean of its divisors is an integer number (14315110).

Almost surely, 2^28630219 is an apocalyptic number.

28630219 is a deficient number, since it is larger than the sum of its proper divisors (1).

28630219 is an equidigital number, since it uses as much as digits as its factorization.

28630219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 28630219 is about 5350.7213532383. The cubic root of 28630219 is about 305.9202484862.

The spelling of 28630219 in words is "twenty-eight million, six hundred thirty thousand, two hundred nineteen".