6728447543 has 4 divisors (see below), whose sum is σ = 6757829640.
Its totient is φ = 6699065448.
The previous prime is 6728447533. The next prime is 6728447549. The reversal of 6728447543 is 3457448276.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-6728447543 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 6728447491 and 6728447500.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (6728447549) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14690705 + ... + 14691162.
It is an arithmetic number, because the mean of its divisors is an integer number (1689457410).
Almost surely, 26728447543 is an apocalyptic number.
6728447543 is a deficient number, since it is larger than the sum of its proper divisors (29382097).
6728447543 is a wasteful number, since it uses less digits than its factorization.
6728447543 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 29382096.
The product of its digits is 4515840, while the sum is 50.
The square root of 6728447543 is about 82027.1146816710.
The cubic root of 6728447543 is about 1887.8679936156.
The spelling of 6728447543 in words is "six billion, seven hundred twenty-eight million, four hundred forty-seven thousand, five hundred forty-three".