19283968728 has 128 divisors (see below), whose sum is σ = 55695384000. Its totient is φ = 6254050176.

The previous prime is 19283968721. The next prime is 19283968733. The reversal of 19283968728 is 82786938291.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19283968721) 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, 632458 + ... + 662246.

Almost surely, 2^19283968728 is an apocalyptic number.

19283968728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19283968728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27847692000).

19283968728 is an abundant number, since it is smaller than the sum of its proper divisors (36411415272).

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

19283968728 is an equidigital number, since it uses as much as digits as its factorization.

19283968728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29853 (or 29831 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The spelling of 19283968728 in words is "nineteen billion, two hundred eighty-three million, nine hundred sixty-eight thousand, seven hundred twenty-eight".