19856257248 has 96 divisors (see below), whose sum is σ = 52709336064. Its totient is φ = 6544681472.

The previous prime is 19856257217. The next prime is 19856257271. The reversal of 19856257248 is 84275265891.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3155161 + ... + 3161447.

It is an arithmetic number, because the mean of its divisors is an integer number (549055584).

Almost surely, 2^19856257248 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 19856257248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26354668032).

19856257248 is an abundant number, since it is smaller than the sum of its proper divisors (32853078816).

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

19856257248 is a wasteful number, since it uses less digits than its factorization.

19856257248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6664 (or 6656 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 57.

The spelling of 19856257248 in words is "nineteen billion, eight hundred fifty-six million, two hundred fifty-seven thousand, two hundred forty-eight".