19728031543 has 12 divisors (see below), whose sum is σ = 21694934464. Its totient is φ = 17925969600.

The previous prime is 19728031501. The next prime is 19728031549. The reversal of 19728031543 is 34513082791.

It is a de Polignac number, because none of the positive numbers 2^k-19728031543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19728031543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19728031549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 221263 + ... + 297343.

Almost surely, 2^19728031543 is an apocalyptic number.

19728031543 is a deficient number, since it is larger than the sum of its proper divisors (1966902921).

19728031543 is a wasteful number, since it uses less digits than its factorization.

19728031543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78246 (or 78235 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 19728031543 in words is "nineteen billion, seven hundred twenty-eight million, thirty-one thousand, five hundred forty-three".