19434849728 has 224 divisors, whose sum is σ = 47007475200. Its totient is φ = 7797436416.

The previous prime is 19434849719. The next prime is 19434849737. The reversal of 19434849728 is 82794843491.

It is an interprime number because it is at equal distance from previous prime (19434849719) and next prime (19434849737).

It is a tau number, because it is divible by the number of its divisors (224).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72248378 + ... + 72248646.

It is an arithmetic number, because the mean of its divisors is an integer number (209854800).

Almost surely, 2^19434849728 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 19434849728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23503737600).

19434849728 is an abundant number, since it is smaller than the sum of its proper divisors (27572625472).

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

19434849728 is a wasteful number, since it uses less digits than its factorization.

19434849728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467 (or 457 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 59.

The spelling of 19434849728 in words is "nineteen billion, four hundred thirty-four million, eight hundred forty-nine thousand, seven hundred twenty-eight".