28943219 has 4 divisors (see below), whose sum is σ = 29417760. Its totient is φ = 28468680.

The previous prime is 28943203. The next prime is 28943237. The reversal of 28943219 is 91234982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91234982 = 2 ⋅45617491.

It is a cyclic number.

It is not a de Polignac number, because 28943219 - 2⁴ = 28943203 is a prime.

It is a super-2 number, since 2×28943219² = 1675419852163922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28943249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237179 + ... + 237300.

It is an arithmetic number, because the mean of its divisors is an integer number (7354440).

Almost surely, 2^28943219 is an apocalyptic number.

28943219 is a deficient number, since it is larger than the sum of its proper divisors (474541).

28943219 is an equidigital number, since it uses as much as digits as its factorization.

28943219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474540.

The product of its digits is 31104, while the sum is 38.

The square root of 28943219 is about 5379.8902405161. The cubic root of 28943219 is about 307.0310352113.

The spelling of 28943219 in words is "twenty-eight million, nine hundred forty-three thousand, two hundred nineteen".