28609019 has 2 divisors, whose sum is σ = 28609020. Its totient is φ = 28609018.

The previous prime is 28609013. The next prime is 28609027. The reversal of 28609019 is 91090682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28609019 - 2¹² = 28604923 is a prime.

It is a super-2 number, since 2×28609019² = 1636951936284722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28609019.

It is not a weakly prime, because it can be changed into another prime (28609013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14304509 + 14304510.

It is an arithmetic number, because the mean of its divisors is an integer number (14304510).

Almost surely, 2^28609019 is an apocalyptic number.

28609019 is a deficient number, since it is larger than the sum of its proper divisors (1).

28609019 is an equidigital number, since it uses as much as digits as its factorization.

28609019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 28609019 is about 5348.7399450712. The cubic root of 28609019 is about 305.8447209382.

The spelling of 28609019 in words is "twenty-eight million, six hundred nine thousand, nineteen".