28678019 has 2 divisors, whose sum is σ = 28678020. Its totient is φ = 28678018.

The previous prime is 28677989. The next prime is 28678021. The reversal of 28678019 is 91087682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28678019 - 2²⁰ = 27629443 is a prime.

It is a super-2 number, since 2×28678019² = 1644857547528722, which contains 22 as substring.

Together with 28678021, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28678519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14339009 + 14339010.

It is an arithmetic number, because the mean of its divisors is an integer number (14339010).

Almost surely, 2^28678019 is an apocalyptic number.

28678019 is a deficient number, since it is larger than the sum of its proper divisors (1).

28678019 is an equidigital number, since it uses as much as digits as its factorization.

28678019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 28678019 is about 5355.1861779027. The cubic root of 28678019 is about 306.0904050308.

The spelling of 28678019 in words is "twenty-eight million, six hundred seventy-eight thousand, nineteen".