19728146660 has 24 divisors (see below), whose sum is σ = 41434061760. Its totient is φ = 7890315104.

The previous prime is 19728146657. The next prime is 19728146663. The reversal of 19728146660 is 6664182791.

It is an interprime number because it is at equal distance from previous prime (19728146657) and next prime (19728146663).

It is a junction number, because it is equal to n+sod(n) for n = 19728146599 and 19728146608.

It is not an unprimeable number, because it can be changed into a prime (19728146663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126737 + ... + 235623.

It is an arithmetic number, because the mean of its divisors is an integer number (1726419240).

Almost surely, 2^19728146660 is an apocalyptic number.

19728146660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19728146660 is an abundant number, since it is smaller than the sum of its proper divisors (21705915100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19728146660 is a wasteful number, since it uses less digits than its factorization.

19728146660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117955 (or 117953 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 19728146660 in words is "nineteen billion, seven hundred twenty-eight million, one hundred forty-six thousand, six hundred sixty".