19728475 has 12 divisors (see below), whose sum is σ = 26345536. Its totient is φ = 14568480.

The previous prime is 19728473. The next prime is 19728491. The reversal of 19728475 is 57482791.

It is not a de Polignac number, because 19728475 - 2¹ = 19728473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19728473) 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 11 ways as a sum of consecutive naturals, for example, 30027 + ... + 30676.

Almost surely, 2^19728475 is an apocalyptic number.

19728475 is a deficient number, since it is larger than the sum of its proper divisors (6617061).

19728475 is a wasteful number, since it uses less digits than its factorization.

19728475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60726 (or 60721 counting only the distinct ones).

The product of its digits is 141120, while the sum is 43.

The square root of 19728475 is about 4441.6747967405. The cubic root of 19728475 is about 270.2077733129.

It can be divided in two parts, 197 and 28475, that multiplied together give a triangular number (5609575 = T₃₃₄₉).

The spelling of 19728475 in words is "nineteen million, seven hundred twenty-eight thousand, four hundred seventy-five".