19728067 has 4 divisors (see below), whose sum is σ = 20261296. Its totient is φ = 19194840.

The previous prime is 19728017. The next prime is 19728073. The reversal of 19728067 is 76082791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76082791 = 2113 ⋅36007.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19728067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19728017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266559 + ... + 266632.

It is an arithmetic number, because the mean of its divisors is an integer number (5065324).

Almost surely, 2^19728067 is an apocalyptic number.

19728067 is a deficient number, since it is larger than the sum of its proper divisors (533229).

19728067 is an equidigital number, since it uses as much as digits as its factorization.

19728067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533228.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 19728067 is about 4441.6288678817. The cubic root of 19728067 is about 270.2059105987.

The spelling of 19728067 in words is "nineteen million, seven hundred twenty-eight thousand, sixty-seven".