19404647424 has 132 divisors (see below), whose sum is σ = 56800008616. Its totient is φ = 6379388928.

The previous prime is 19404647407. The next prime is 19404647461. The reversal of 19404647424 is 42474640491.

It is a self number, because there is not a number n which added to its sum of digits gives 19404647424.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 658347 + ... + 687189.

Almost surely, 2^19404647424 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 19404647424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28400004308).

19404647424 is an abundant number, since it is smaller than the sum of its proper divisors (37395361192).

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

19404647424 is a wasteful number, since it uses less digits than its factorization.

19404647424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28942 (or 28921 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 45.

The spelling of 19404647424 in words is "nineteen billion, four hundred four million, six hundred forty-seven thousand, four hundred twenty-four".