19728455 has 16 divisors (see below), whose sum is σ = 24377760. Its totient is φ = 15320448.

The previous prime is 19728427. The next prime is 19728473. The reversal of 19728455 is 55482791.

It is a cyclic number.

It is not a de Polignac number, because 19728455 - 2¹⁰ = 19727431 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28544 + ... + 29226.

It is an arithmetic number, because the mean of its divisors is an integer number (1523610).

Almost surely, 2^19728455 is an apocalyptic number.

19728455 is a deficient number, since it is larger than the sum of its proper divisors (4649305).

19728455 is a wasteful number, since it uses less digits than its factorization.

19728455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850.

The product of its digits is 100800, while the sum is 41.

The square root of 19728455 is about 4441.6725453369. The cubic root of 19728455 is about 270.2076820040.

The spelling of 19728455 in words is "nineteen million, seven hundred twenty-eight thousand, four hundred fifty-five".