19728518903718 has 64 divisors (see below), whose sum is σ = 42288588352512. Its totient is φ = 6119774432640.

The previous prime is 19728518903713. The next prime is 19728518903719. The reversal of 19728518903718 is 81730981582791.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19728518903713) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69366063 + ... + 69649893.

It is an arithmetic number, because the mean of its divisors is an integer number (660759193008).

Almost surely, 2^{19728518903718} is an apocalyptic number.

19728518903718 is an abundant number, since it is smaller than the sum of its proper divisors (22560069448794).

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

19728518903718 is a wasteful number, since it uses less digits than its factorization.

19728518903718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297509.

The product of its (nonzero) digits is 60963840, while the sum is 69.

The spelling of 19728518903718 in words is "nineteen trillion, seven hundred twenty-eight billion, five hundred eighteen million, nine hundred three thousand, seven hundred eighteen".