19892543968 has 192 divisors, whose sum is σ = 46463155200. Its totient is φ = 8288501760.

The previous prime is 19892543963. The next prime is 19892543989. The reversal of 19892543968 is 86934529891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19892543963) 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, 45313093 + ... + 45313531.

It is an arithmetic number, because the mean of its divisors is an integer number (241995600).

Almost surely, 2^19892543968 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 19892543968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23231577600).

19892543968 is an abundant number, since it is smaller than the sum of its proper divisors (26570611232).

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

19892543968 is a wasteful number, since it uses less digits than its factorization.

19892543968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705 (or 697 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 64.

The spelling of 19892543968 in words is "nineteen billion, eight hundred ninety-two million, five hundred forty-three thousand, nine hundred sixty-eight".