19728195305 has 16 divisors (see below), whose sum is σ = 29137027584. Its totient is φ = 12487296960.

The previous prime is 19728195301. The next prime is 19728195317. The reversal of 19728195305 is 50359182791.

It is not a de Polignac number, because 19728195305 - 2² = 19728195301 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19728195301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21678881 + ... + 21679790.

It is an arithmetic number, because the mean of its divisors is an integer number (1821064224).

Almost surely, 2^19728195305 is an apocalyptic number.

It is an amenable number.

19728195305 is a deficient number, since it is larger than the sum of its proper divisors (9408832279).

19728195305 is a wasteful number, since it uses less digits than its factorization.

19728195305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43358696.

The product of its (nonzero) digits is 680400, while the sum is 50.

The spelling of 19728195305 in words is "nineteen billion, seven hundred twenty-eight million, one hundred ninety-five thousand, three hundred five".