19789774848 has 210 divisors, whose sum is σ = 59378733414. Its totient is φ = 6568280064.

The previous prime is 19789774819. The next prime is 19789774883. The reversal of 19789774848 is 84847798791.

19789774848 is a `hidden beast` number, since 1 + 9 + 78 + 9 + 77 + 484 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14353956864 + 5435817984 = 119808^2 + 73728^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a zygodrome in base 8.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 84934540 + ... + 84934772.

Almost surely, 2^19789774848 is an apocalyptic number.

19789774848 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19789774848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29689366707).

19789774848 is an abundant number, since it is smaller than the sum of its proper divisors (39588958566).

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

19789774848 is an frugal number, since it uses more digits than its factorization.

19789774848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 238 counting only the distinct ones).

The product of its digits is 227598336, while the sum is 72.

The spelling of 19789774848 in words is "nineteen billion, seven hundred eighty-nine million, seven hundred seventy-four thousand, eight hundred forty-eight".