19343857728 has 224 divisors, whose sum is σ = 59788592640. Its totient is φ = 5464719360.

The previous prime is 19343857723. The next prime is 19343857747. The reversal of 19343857728 is 82775834391.

It is a super-2 number, since 2×19343857728² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19343857723) 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, 1734153 + ... + 1745271.

It is an arithmetic number, because the mean of its divisors is an integer number (266913360).

Almost surely, 2^19343857728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19343857728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29894296320).

19343857728 is an abundant number, since it is smaller than the sum of its proper divisors (40444734912).

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

19343857728 is a wasteful number, since it uses less digits than its factorization.

19343857728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11205 (or 11195 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 57.

The spelling of 19343857728 in words is "nineteen billion, three hundred forty-three million, eight hundred fifty-seven thousand, seven hundred twenty-eight".