19212744768 has 84 divisors (see below), whose sum is σ = 59133132432. Its totient is φ = 5489352960.

The previous prime is 19212744763. The next prime is 19212744823. The reversal of 19212744768 is 86744721291.

It is a tau number, because it is divible by the number of its divisors (84).

It is a super-2 number, since 2×19212744768² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19212744768.

It is not an unprimeable number, because it can be changed into a prime (19212744763) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1011678 + ... + 1030493.

Almost surely, 2^19212744768 is an apocalyptic number.

It is an amenable number.

19212744768 is an abundant number, since it is smaller than the sum of its proper divisors (39920387664).

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

19212744768 is a wasteful number, since it uses less digits than its factorization.

19212744768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042200 (or 2042183 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 51.

The spelling of 19212744768 in words is "nineteen billion, two hundred twelve million, seven hundred forty-four thousand, seven hundred sixty-eight".