19728054916 has 6 divisors (see below), whose sum is σ = 34524096110. Its totient is φ = 9864027456.

The previous prime is 19728054859. The next prime is 19728054919. The reversal of 19728054916 is 61945082791.

It can be written as a sum of positive squares in only one way, i.e., 19336014916 + 392040000 = 139054^2 + 19800^2 .

It is not an unprimeable number, because it can be changed into a prime (19728054919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2466006861 + ... + 2466006868.

Almost surely, 2^19728054916 is an apocalyptic number.

It is an amenable number.

19728054916 is a deficient number, since it is larger than the sum of its proper divisors (14796041194).

19728054916 is a wasteful number, since it uses less digits than its factorization.

19728054916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4932013733 (or 4932013731 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 19728054916 in words is "nineteen billion, seven hundred twenty-eight million, fifty-four thousand, nine hundred sixteen".