19890256848 has 480 divisors, whose sum is σ = 68395622400. Its totient is φ = 4865710080.

The previous prime is 19890256811. The next prime is 19890256849. The reversal of 19890256848 is 84865209891.

It is a junction number, because it is equal to n+sod(n) for n = 19890256791 and 19890256800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19890256849) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 83222713 + ... + 83222951.

It is an arithmetic number, because the mean of its divisors is an integer number (142490880).

Almost surely, 2^19890256848 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 19890256848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34197811200).

19890256848 is an abundant number, since it is smaller than the sum of its proper divisors (48505365552).

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

19890256848 is a wasteful number, since it uses less digits than its factorization.

19890256848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 9953280, while the sum is 60.

The spelling of 19890256848 in words is "nineteen billion, eight hundred ninety million, two hundred fifty-six thousand, eight hundred forty-eight".