19728016357 has 4 divisors (see below), whose sum is σ = 22546304416. Its totient is φ = 16909728300.

The previous prime is 19728016339. The next prime is 19728016361. The reversal of 19728016357 is 75361082791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75361082791 = 23 ⋅3276568817.

It is a cyclic number.

It is not a de Polignac number, because 19728016357 - 2¹⁵ = 19727983589 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 19728016357.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19728011357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1409144019 + ... + 1409144032.

It is an arithmetic number, because the mean of its divisors is an integer number (5636576104).

Almost surely, 2^19728016357 is an apocalyptic number.

It is an amenable number.

19728016357 is a deficient number, since it is larger than the sum of its proper divisors (2818288059).

19728016357 is an equidigital number, since it uses as much as digits as its factorization.

19728016357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2818288058.

The product of its (nonzero) digits is 635040, while the sum is 49.

The spelling of 19728016357 in words is "nineteen billion, seven hundred twenty-eight million, sixteen thousand, three hundred fifty-seven".