19728061 has 4 divisors (see below), whose sum is σ = 20766400. Its totient is φ = 18689724.

The previous prime is 19728017. The next prime is 19728073. The reversal of 19728061 is 16082791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19728061 - 2⁷ = 19727933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19728161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 519141 + ... + 519178.

It is an arithmetic number, because the mean of its divisors is an integer number (5191600).

Almost surely, 2^19728061 is an apocalyptic number.

It is an amenable number.

19728061 is a deficient number, since it is larger than the sum of its proper divisors (1038339).

19728061 is a wasteful number, since it uses less digits than its factorization.

19728061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038338.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 19728061 is about 4441.6281924538. The cubic root of 19728061 is about 270.2058832057.

The spelling of 19728061 in words is "nineteen million, seven hundred twenty-eight thousand, sixty-one".